Which sentence is expressed correctly?

Which sentence is expressed correctly?
 A) Scott uses the following Facebook business applications, Marketplace, Inside Job, and SlideShare.
 B) Scott uses the following Facebook business applications: Marketplace, Inside Job, and SlideShare.
 C) Scott uses the following Facebook business applications; Marketplace, Inside Job, and SlideShare.

Ques. 2

E-mail is appropriate for short, informal messages that request information and respond to inquiries.
  Indicate whether the statement is true or false

Ques. 3

Which sentence is expressed correctly?
 A) Pao completed the research; Lee wrote the first draft; and Milo edited the report.
 B) Pao completed the research, Lee wrote the first draft and Milo edited the report.
 C) Pao completed the research, Lee wrote the first draft, and Milo edited the report.

Ques. 4

Social media messages have replaced e-mail messages within organizations and to external audiences.
  Indicate whether the statement is true or false