What is it that you mean or language and typ it English,Spanish or french so I can understand put mostly put it in English, please.
The correct answer is B) because a run-on sentence is a sentence which is incorrectly punctuated. In this case, B doesn't have the right punctuation mark. Instead of a comma (,) perhaps a semicolon (;) should be used.
1.a/2.b/3.d/4.b all these answers are based on my opinion