To my mind the correct answer is (A).
"Many Americans travel to Costa Rica during the winter months, the peak season, because of the warmer temperatures found at many of Costa Rica’s tropical beaches and lush rain forests. "
In this sentence, the author decides to add additional information through an APPOSITIVE PHRASE. If the writer decides to delete "the peak season" from the sentence, the meaning of the sentence will remain.
Answer:
we don't know the theme so we can't help you
It is A, a gloomy day. when u think of black clouds, its gloomy, almost like its going to rain. it cant be the sun is setting because when it sets, clouds are sort of pinkish.if the clouds are moving, that really has nothing to do with the sentance. i hope this answer has helped.