You want to setup four blocks of content on your page. Each of the four blocks of content is in a separate div. The layout you want is depicted below. Assuming you want this layout on a small screen, which of the following group of classes would you apply to achieve this?

#1

#2

#3

#4

Question

You want to setup four blocks of content on your page.  Each of the four blocks of content is in a separate div.  The layout you want is depicted below.  Assuming you want this layout on a small screen, which of the following group of classes would you apply to achieve this?

#1

#2

#3

#4

BlackTom AI · Accepted Answer

Bootstrap's 12-column grid divides each row into 12 units, so you assign columns whose widths add to 12 per row. Using the col-sm-* classes controls layout at the small-screen breakpoint and up, so to get a full-width block, use col-sm-12; to get two equal halves side-by-side, use col-sm-6 for each.

1) Relevant knowledge points and concepts
- Bootstrap grid: 12 columns per row. Sum of column numbers in a row should equal 12 to fill the row without wrapping.
- col-sm-* applies the column sizing at the "small" breakpoint and larger; elements use those widths to form rows.
- To make a full-width block: col-sm-12. To make two half-width blocks side-by-side: two col-sm-6 columns.

2) Step-by-step reasoning
- Block #1 should span the full width → assign col-sm-12.
- Blocks #2 and #3 should appear side-by-side in the same row as two equal halves → assign col-sm-6 and col-sm-6. Check sum: 6 + 6 = 12, so they occupy one full row together.
- Block #4 should again be full width → assign col-sm-12.

3) Intermediate calculations
- Row 1: #1 = 12 → 12/12 = full width.
- Row 2: #2 + #3 = 6 + 6 = 12 → two equal halves filling the row.
- Row 3: #4 = 12 → full width.

4) Why the correct answer is correct
Because the chosen classes produce rows whose column sums equal 12 in the desired grouping: full-width, then two halves, then full-width. The col-sm- prefix ensures this layout at the small-screen breakpoint.

5) Why other options are incorrect (brief)
- Option with #3/#4 as col-sm-3: 12 + 6 + 3 + 3 would place #2 as half-width and #3/#4 as quarter-width, not two equal halves.
- All col-sm-6: four items at 6 each would produce two rows of two halves (6+6 then 6+6), not the full / halves / full pattern.
- col-sm-4,4,6,6: first row (4+4) = 8 leaves unused space and doesn’t match desired full-width first block or full-width last block.

6) Conclusion
The correct grouping is: #1 col-sm-12 | #2 col-sm-6 | #3 col-sm-6 | #4 col-sm-12, which matches the provided answer.

You want to setup four blocks of content on your page. Each of the four blocks of content is in a separate div. The layout you want is depicted below. Assuming you want this layout on a small screen, which of the following group of classes would you apply to achieve this? #1 #2 #3 #4 单项选择题

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