The correct option is A. A city or vacation spot located near the ocean is in danger of a tidal wave.
The subject of the sentence is compound. That means that it has two noun phrases that are joined. In this case, the two noun phrases are joined by "or" which gives a sense of choice between one thing or the other. Moreover, each noun phrase in the subject are in singular form. As a result, the verb should be in its singular form as well.
Answer:
I will treat others as I wish to be treated. ...
I will be honest and transparent in my personal and professional life. ...
I will always put forth my best effort, and I will maintain a healthy work-life balance.
Explanation:
Taking into account the statement above: "For several days ensuing, her name was unmentioned by either Usher or myself: and during this period I was busied in earnest endeavours to alleviate the melancholy of my friend.What does this excerpt reveal about the narrator of the story?"
The answer is: it describes what the narrator experiences in the story.
Hope this helps.