I believe it is C. Try and think about where you would naturally pause, you wouldn't say "Tourists in Mexico *pause* enjoy eating the rich, delicious food."
Indelible means permanent. An indelible moment would be something like going to a job interview and the first impression you make is indelible, it can't be changed or redone.
The setting of the story was important as D. The vibrant setting of Los Angeles helps Alejandro realize why his mother decided to stay in Mexico after her family moved.
The setting of a story simply means where and when a story takes place. It is the location where a story takes place. The elements of a setting include place, mood, and time.
In the story, the setting of the story affected how Alejandro understands his mother as it helps him realize why his mother decided to stay in Mexico after her family moved.
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The answer is B, Incendiary
There is more than one conjunction in the sentence, the word but acts as a coordinating conjunction. Also the words not only and but also act as a correlative conjunction.