What do tennis players Billie Jean King, André Agassi, Rod Laver and Steffi Graf have in common?

Question: What do tennis players Billie Jean King, André Agassi, Rod Laver and Steffi Graf have in common?

Options:

They were number 1 more than 30 weeks
They won 4 Grand Slams
They injured their left wrist
They won the Olympic Gold Medal

Correct answer:

They won 4 Grand Slams

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