Which word could best replace either of the underlined words in the paragraph?

the air at the top of mt. everest, the highest mountain in the world, is very thin. it makes it hard for people to breathe at that height. when mountain climbers reach the summit, they need to use oxygen tanks to breathe at such a high altitude.

a.
peak

b.
distance

c.
site

d.
elevation

i would say that these are the two thesis statements best for a literary analysis essay on recurring themes in shakespeare's romeo and juliet:

1.  in romeo and juliet, shakespeare demonstrates that love comes in a variety of forms, be it romantic, familial, or between friends.

2.  shakespeare explores the struggle for identity through the character of juliet in his play romeo and juliet.

the other theses aren't reoccurring in this play. 

explanation: