What is the value of the variable phones after the following code executes? phones = {'John' : '555-5555', 'Julie' : '555-7777'} phones['John'] = '555-6666'单项选择题

A

{'John': '555-6666', 'Julie': '555-7777'}

B

{'John': '555-5555, 'John': '555-6666', 'Julie': '555-7777'}

C

{'John': '555-5555', 'Julie': '555-7777'}

D

{'John': '555-6666'}

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