C he's worried about the kids
It seems that you have already filled the correct pronoun in the blank provided. Yes, the correct answer to complete this sentence is the pronoun "this". The pronoun "this" is an example of a demonstrative pronoun. Other demonstrative pronouns also include these, those, and that. Hope this answer helps.
Answer:
Correct option is D: Community gardens began in 1998, which resulted in a positive environmental impact on neighborhoods across the nation.
Explanation:
The most format style of a sentences is shown in option D because it provides great meaning without too much full-stops and avoid parallel errors. In option A and B, there are too many stops and almost meaningless phrases standing alone. Option C would have been a good option, but using "so" after the comma and "worry about getting good" and "healthy stuff to eat" makes it informal.