C.
This is because the question says "than" followed by a name (noun). You can say more friendly but it is not commonly used in the US.
Here is a link of the meanings of Adjectives_nouns and pronouns and even more you might want. ^_^
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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.
