Which sentence is correctly punctuated? a. jessie's favorite sports are: softball, volleyball, and field hockey. b. you ought to interview these people: mr. ryan, mrs. komanowski, and ms. thayer. c. the books you will need include: belle prater's boy and the diary of anne frank. d. the college is offering: french, japanese, and russian language courses.

The correct answer is B. 

The other options are incorrect because the colons are unnecessary. They break up an otherwise complete sentence (i.e. Jessie's favorite sports are softball, volleyball, and field hockey.). 

Option B is correct because without the colon, the sentence would not make sense (i.e. You ought to interview these people Mr. Ryan, Mrs. Komanowski, and Ms. Thayer).