Question

I will medal!!

Which sentence uses a verb that agrees with its compound subject?

A.
Calcium and magnesium is necessary for strong bones.

B.
Sam and Li rides their skateboards around the neighborhood.

C.
Now either blankets or a thick coat keep us warm.

D.
Those children and the tired adult have waited many hours.

Answer 1

Any ideas?

Answer 2

A or c

Answer 3

C is incorrect.
Either should be both.

Answer 4

So A?

Answer 5

Yes.