The keywords are "endeared...misanthropic bent." Misanthropic readers are those who have a general ill-will towards humanity. Therefore, the travel writer must be expressing some negative attitude. (C) means interpreting others behavior as solely motivated by self-interest. A misanthropic person is prone to looking cynically upon the actions of others.
(A), while negative, does not fit the context.
(B) would not endear the writer to misanthropes.
(D) means talkativeness.
(E) means excessively fawning.
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