Problem: The box could not stand on the edge like the pot did because the

My choice: box is unbalanced.

Problem: Erin sent a memorandum to Kayla for their opinion.

My choice: Erin didn't agree with the reply they received.

Problem: Maria gets Kayla to pose so that she can draw her, because

My choice: Maria is a better artist.

Problem: Betty had a much better harvest this season than Carrie because

My choice:
Carrie is an average farmer.