LSAT LR conditional sample question

Can someone help me with this template LR question. Its similar to an actual LSAT question I've taken before, but I changed details for purposes of sharing.

There is a new class at school. Students will voluntarily take the new class only if the school makes it mandatory. The school will make the new class mandatory only if students don't voluntarily take it.

What must be true (necessary assumption):

• Students won't voluntarily adopt the new class

• School won't make the new class mandatory

• Other answer???