I would say that the word that gives the most positive connotation to the students <u>is the third one: </u><u><em>active</em></u><u>.</u>
Explanation:
I chose active because, although it is not the only word that has a positive connotation, I think <u>it is the most accurate according to the context.</u> In this sentence, the word <em>active</em> is used as an adjective to describe the students that, just like Carol, are taking charge of the fundraising campaign. <em>Active</em>, when used as an adjective, means to be <em>engaging or ready to engage in physically energetic pursuits</em>, and it is the most suitable for the context. To be <em>active</em> is to be <em>animated, involved</em>, and this is the perfect way to describe the students who choose to take action in this fundraising process.