Indirect Proof Help? Stuck between last 2 choices

What is the assumption needed to begin an indirect proof of the following statement?
"A team is as strong as its weakest member."


A. A team is as strong as its weakest member.
B. A team is as strong as its strongest member.
C. A team is not as strong as its weakest member.
D. A team is not as strong as its strongest member.