In dramatic structure, I think dialogue is used to appeal to the reader by making he/she feel like they are actually there and to just bring it to life. Hope that helps.
Answer:
A. Some students decided they wanted a garden.
Explanation:
A pronoun usually refers to a noun or another pronoun called its antecedent. Whenever you use a pronoun, make sure that it agrees with its antecedent.
In the first sentence, the pronoun <em>they</em> agrees with its antecedent, <em>students</em>. They are both plural.
I think it is a run-on sentence.