Everyone was busy, so I went to the movies alone. This is an example of which type of sentence?

Answer: Compound Sentence

Explanation: A little tough because there's no options, but how it's worded it seems like a compound sentence.

Here are some examples of compound sentences:

I really need to go to work, but I am too sick to drive.

I am counting my calories, yet I really want dessert.

He ran out of money, so he had to stop playing poker.

They got there early, and they got really good seats.

(There's usually a conjuction after a semi colon or comma)

its a compound sentence