Plz help i need to complete this homework

Read this sentence. although the idea was foreign to me, i still thought i would give it a try.

You are working with a volunteer organization improving and repairing houses in an older part of town. your group’s goal is to repair a house today, but your group’s leader is sick at home. an effective group member would do all of the following except? a. discuss and assign roles b. identify and analyze the problem c. organize a list of projects d. follow through on their assigned duty

Which sentence correctly uses a colon to denote a list or enumeration? a. each group will have members fill the following roles: leader, note-taker, and time-keeper. b. our toughest monthly sales goals are in: january, july, and august. c. marketing, distribution, and customer service: are the focus areas for 2017. d. the company will be opening two new offices in: harrisburg and reading.