I believe it would be an example of self discipline, correct me if I'm wrong.
The gerund phrase is:shopping early Use:noun
Answer:
The answer is B.
Explanation:
The other options don't make any sense. Like, really, how would it be A? The answer, the only one that makes sense, is B.
I am sure it is D.); The other options do not make sense. The most logical answer is D.)