i need a answer ASAP
i give extra points and brainliest and i will help you if you give me the answer!

Solve: 6 3/7 - 1 3/6
its mixed number fractions im having a really hard time with it pls help

A: 4 7/13
B: 4 39/42
C: 7 7/13
D: 7 39/42
Again, no links please! and explanation is optional.