Many number mistakes

Which expression matches the problem?

Maggie has 22 students in her class. She is bringing donut holes as a birthday treat. Each student will get 3 donut holes. If she brings 100 donut holes, how many extra donut holes are left?

A: 3 x 23-100
B: 100-3 x 23
C: 100 - (3 x 23)
D: Both B and C are correct.

This is the second problem that I have seen like this, I wont use this app until this is fixed.

Mmhmm kay about iTooch 5th Grade Math