Question

Which is a run-on sentence?

Answer 1

Answer:

Number 1

Explanation:

The sun was setting in the west, the clouds had become a vibrant pink. There is no form of transition in this sentence unlike the other 2. Sentence 2 uses "and" to separate two things that happened in the sentence and Sentence 3 uses a comma before introducing another thing in the sentence.

The first sentence doesn't use any word or comma to separate the two things within the sentence so it's a run-on sentence.