Question

Which of the following is a run-on sentence?

Answer 1

The correct answer is B. The game will be called if the storm continues, the weather is dangerous.
A run-on sentence is a grammatically incorrect sentence where two or more clauses are connected without using an appropriate conjunction, or without a conjunction at all. As you can see in sentence B, we have two clauses (the game will be called if the storm continues and the weather is dangerous) which are ungrammatically connected with just a comma. 

Answer 2

B because each part of the sentence would soun more sensible if read alone as seperate statements.