Question

Which is the following is a run-on sentence?

Answer 1

Let's cut the chit chat, and formalities. I'm not one for greetings or unnecessary niceties.

The answer is A.


Why?
Because a run-on consists of two or more independent clauses that are not separated by a colon or semicolon. 


This is evident in Choice A

Answer 2

Answer:
C. The players both continue to work on both hitting and fielding, allowing them to improve both set skills.

Explanation: 
Both A and D are incorrect, but not run-ons. B is a correct sentence. That only leaves C. Also, C has the word "and". C also has a comma. Making it a run-on sentence.