Which One of the Following Is an Example of Elaboration

Which one of the following is an example of elaboration?

A) Sharon automatically knows how she can best study for an upcoming history test.
B) When Melissa first learns about inertia,she thinks of examples of it in her own life to expand on the idea.
C) Darren repeats the detailed excuses his friend Logan suggests he use to explain why he didn't do his homework.
D) Rosie repeats the spelling of each word several times the night before her spelling test.