Eli is explaining how his humanity was stripped away when all individuality was denied to them in the concentration camps. It means if you are the same as everyone else, you are no longer human, since individuality is a human characteristic, it seperates us from animals. Without individuality you are not human.
The correct sentence that is written correctly is: A) Ever since I was a teenager, I have loved going to the theater.
Here are why the other options are wrong:
B) 'although the lasagna looked terrible, it tasted wonderful.' <-- "although" is not capitalized at the beginning of the sentence. If it's the start of a sentence, you have to capitalize the first letter of the first word.
C) 'Pepper and i decided it was time to head home.' <-- The issue with this is that the sentence does not capitalize "I". Nobody really knows why "I" needs to be capitalized since it is a first person pronoun.
D) 'while Jonathan was napping, I finished doing the dishes.' <-- "While" is not capitalized at the beginning of the sentence, making it improper.
The water used to make the cola is kept below freezing point which makes the drink a bit more carbonated than the regular canned cola