Qiang was asked to memorize a long list of words that included ship, effort,
professor, and inquire. He later recalled these words as boat, work, teacher, and
question. This best illustrates the impact of
a) the spacing effect.
b) implicit memory.
uc) source amnesia.
d) encoding meaning.

a) the spacing effect.              

Explanation:

Spacing effect: In psychology, the term "spacing effect" is described as a phenomenon that states that information that is being presented over a spaced interval is being retained and learned or comprehended more effectively and more easily. However, it is being described as an individual remembering different items in a specific list.

In the question above, the given statement represents the spacing effect.