Compared to a t-distribution with 10 degrees of freedom, and compared to a normal distribution, a t-distribution with 20 degrees of freedom and the same variance has:
Compared to df = 10　 Compared to normal

A.Thinner tails　　　　　　fatter tails

B.Fatter tails　　　　　　thinner tails

C.Fatter tails　　　　　　fatter tails