Three of the Following Teachers Are Providing Scaffolding to Help

Three of the following teachers are providing scaffolding to help their students learn. Which one is not necessarily providing scaffolding?

A) Ms. Applegate gives her students a structure to follow when they write their first essay.
B) Mr. Bernardo teaches students how to perform an overhand throw by gently guiding each student through the correct movement a few times.
C) Ms. Chen gives her class some hints about how to solve an especially difficult word problem.
D) Mr. Donaldson takes his students on an all-day field trip to the art museum.