Answer: a. active
Explanation: An active close (e.g. requesting a meeting, announcing your next phone call, etc.) to a cover letter is a demonstration of your initiative of maintaining contact and following up on the hiring process.
Option 1 is not correct because the quote is no longer Mr. Cliff's wording. The last choice is also not correct because () should only be used if you need to make a letter capital or change the verb tense for the quote to make sense. [Brackets] are used when including clarifying information in quotations, and [high school students] is clarifying who "They" are. Answer B is correct.
Indicate repetition of an idea.

Molecules in the oceans water
International organization composed of independent states brought together to encourage diplomacy and peace between various countries. The UN is also in charge of maintaining treaty obligations and ensuring that countries included in the organization obey international laws.