【单选题】

Woman: What did the teacher want you to do

Man: She asked me to finish doing the assignment in ten minutes.
Woman: In ten minutes That would not be a piece of cake.But did you say "yes"
Question: What does the woman mean
A．The man could be awarded a piece of cake if he can finish the work in 10 minutes.
B．The woman doubted if the man could finish his assignment in 10 minutes.
C．The assignment was too difficult to finish in t0 minutes.
D．A、piece of cake cannot represent the value of the assignment.