What is a run on sentence? a. her book report is due thursday she hasn't read the book yet. b. her closet is full of clothes, yet she says she has nothing to wear. c. her piano lesson starts at 4 o'clock, and she's going to be late. d. her cookies are delicious, so she entered them in a country fair.

I think the answer will be C

A. Her book report is due Thursday she hasn't read the book yet. 

No commas are present, so this sentence seems to go on and on and on and on and on and on and on and onWhen I read that sentence it wanted to say it in 2 breaths but instead, the way it was formatted, i was forced to read it in one. 

Hope this helps. c: