The correct answer is the first option.
The sentence that presents the correct subject-verb agreement is the first one since in it we are talking about "heavy rains" OR "fast-melting snow". In other words, the subject is coordinated by the conjunction "OR" which makes the subject singular. The verb "causes" is conjugated in the third person singular.
The main idea is about freedom or being independent.
Explanation:
- This is an excerpt from Into the Wild by Jon Krakauer
- This is about a man who went into the wild on adventure. he met many people who were willing to help him. The main idea was McCandless wanted to be free from people who show their authority.
- The level of freedom he requires is complete isolation. He says he wanted to wear shoes without socks but the rule is that the employees had to wear proper footwear.
He fell sad about the swallow
B) Infectious diseases were a great source of concern
