Which is not a combination?

Question

A. Choosing 3 toppings for your Pizza.
B. Lining 3 students up in a row.
C. Choosing 2 toppings from a tray of 10.
D. Choosing 5 students to represent a class of 30.
Is the answer D?
Thank you for your help.

Answer 1

I prefer B, where the order matters.