Punctuation Correction in Complex Sentences

Hard Standard English Conventions Punctuation

Read the following sentence:

As the sun set behind the mountains it cast a beautiful glow over the valley the colors were breathtaking.

Which of the following options correctly punctuates the sentence?

As the sun set behind the mountains, it cast a beautiful glow over the valley; the colors were breathtaking.

As the sun set behind the mountains it cast a beautiful glow over the valley, the colors were breathtaking.

As the sun set behind the mountains, it cast a beautiful glow over the valley the colors were breathtaking.

As the sun set behind the mountains it cast a beautiful glow over the valley. The colors were breathtaking.

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