the words help bring the piece of writing to life. they may help in creating imagery, and they may even help the reader feel like they are involved in the story. the choice of words can also help set the mood for the story like mysterious, happy, sad, etc.
The answer is B. Inexhaustible
In general, it's often best to choose the shorter, cleaner, and simpler word when choosing between two words for a piece. In writing, simplicity and clarity are crucial.