We use pronouns so that we are not repetitive.
Answer: A) or the first option.
A pronoun is really a word that takes the spot of a noun, without pronouns sentences really wouldn't make sense or be clear here are examples.
Deaththekid101 answered a question
He answered a question
The spider is crawling
It is crawling
Zaxby's is the best resturaunt
This is the best resturaunt
See? pronouns take places so its important we have them.
How he is blind, Who his family was, How he gets food/live.
Answer:
Distance North or South of the Equator.
Explanation:
idk what the sentence above is, but it's probably C) Several cities with large populations have many asthma-related health problems.