The description that would improve the setting in the passage above best is "Eating dinner one chilly evening, my master and I...". Because it will set the mood of the retelling of his master's story.
Normally pictures, music, sounds, basically anything exciting. Make it like a movie.
B. Solar power saves money for the user and makes the world a better place all around.
A is a personal opinion, C is not specific at al, D is factual, but it doesn't exactly make sense because though it helps the environment it doesn't really sustain our resources. Therefore B is the correct answer.
The answer is D. A verb that starts with "to" is in an infinitive verb form. It should be noted that a verb in this form does not function as a verb instead it functions as another part of speech. Infinitives can function as adverbs, adjectives or as nouns.