Which transition word best connects the ideas in this paragraph?

ever since central city airport petitioned the council to build a new runway, calls to my office have increased more than 75 percent. the vast majority of my constituents do not support the airport's expansion. they expressed concerns about noise pollution, traffic gridlock, and danger to the migratory habitat near the proposed runway.
a. nonetheless
b. lastly
c. yet
d. rather

Ever since Central City Airport petitioned the council to build a new runway, calls to my office have increased more than 75 percent. The vast majority of my constituents do not support the airport's expansion. , they expressed concerns about noise pollution, traffic gridlock, and danger to the migratory habitat near the proposed runway.

D. Rather

The transition word that best connects the ideas in the paragraph is letter D. rather.

Explanation:

The speaker in this paragraph explains that he has been receiving more calls in his office due to the petition to build a new runway by an airport. He proceeds to explain that the vast majority of the people are against the runway. The way he says it, people "do not support the airport's expansion". Instead of supporting it, they express their concerns.

Ever since Central City Airport petitioned the council to build a new runway, calls to my office have increased more than 75 percent. The vast majority of my constituents do not support the airport's expansion. Rather, they expressed concerns about noise pollution, traffic gridlock, and danger to the migratory habitat near the proposed runway.

He is mentioning what people are doing. They are doing this instead of doing that. The transitional word that best expresses that idea is rather. Nonetheless and yet would be appropriate if he were mentioning that, despite not supporting the expansion, people see the advantages. Lastly would appropriate if the speaker had been listing items or events in a sequence. At no point did he do that (there is not a "firstly" for there to be a "lastly").

The sentence we are given is: 'THE LETTER ARRIVED EVERY MONDAY.'
The noun in this sentence, which can be replaced by a pronoun is 'letter'. The letter is in singular form, in plural form it will becomes letters. If you want to use pronoun to represent the word 'letters', the correct pronoun to use is 'they'.
Thus, the sentence will become: THEY ARRIVED EVERY MONDAY. This is the plural form of the sentence that is given in the question.