What is an important drawback of using text generated by consumers on social media for a marketing research study? Choose one best answer: 单项选择题

A

In most cases, the sample opinions that can be collected on social media is too small

B

Text data generated by consumers on social media are unstructured and cannot be used for analysis by machines

C

The group of consumers who expressed their opinions on social media may not be representative of consumer population

D

Collecting data on social media is more expensive than conducting a survey by phone

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