Answer:
him driving to the post office
Explanation:
because we are trying to find out how far his office is, we do not need to know how fat the post office is
Answer: I would contend that the right answer is actually "to fake."
Explanation: Just to elaborate a little on the answer, it can be added that one of the meanings of the verb to affect is to feign, which can be translated as to pretend or to give a false appearance of something. If the character was trying to "conceal certain inconvenient emotions" which, nevertheless, "seemed inclined to assert themselves" by affecting high spirits, he was, therefore, faking those high spirits, in order to hide his true feelings from the people who had just arrived.
Melodrama. It first appeared in France at the end of the 18th century. Later, it reached Britain and became one of the most popular types of drama in the 19th century!