[Q]: How does the sentence end?

Ian usually wore contact lenses, whereas Steven stuck to wearing glasses, because

[A]: Ian was vain.

[Q]: How does the sentence end?

Mary stopped feeding the cow grass and began to only feed it grain, because the

[A]: grass made the cow sick.

[Q]: How does the sentence end?

The toddler preferred to play with the ball than with the bike because the

[A]:
ball needed less coordination.