I think C is the most accurate choose to define elaboration
The purpose of the expository essay is to explain a topic in a logical and straightforward manner. Without bells and whistles, expository essays present a fair and balanced analysis of a subject based on facts, with no references to the writer's opinions or emotions
It is like a research paper
Answer: A. ". . .The energy of the game is more than the energy we partners put in."
The theme that the author wants to convey is that of different parts coming together in order to achieve something that is bigger than the parts themselves. This sentence expresses this sentiment the best by explaining that the energy of the game is more than the sum of the energy each one of the partners puts in. In other words, the whole is greater than the sum of its parts.