Problem: People say that Craig is a bad parent, but Kyle is a good one. This is because

My choice: Craig is impatient.

Problem: Robert was teaching the students the wrong way unlike Derrick because

My choice: Robert thought it was quicker.

Problem: While hiking, Carrie asked Natalie to identify the fern she was looking at becasue

My choice: Carrie had limited knowledge of plants.

Problem: Benjamin likes to give speeches to large groups but Eric doesn't because

My choice:
Eric is very shy.