In sentence 12, the writer wants to clarify the paragraph’s line of reasoning and explain the relevance of the evidence in sentences 13 and 14 to the paragraph’s main idea. Which version of sentence 12 (reproduced below) would best accomplish this goal?

Read the sentence a student wrote. as he listened to the haunting notes of the song the author realized he had found the inspiration for his next suspense novel. the teacher reviewing this sentence would point out that since this is a complex sentence, there should be a comma after “song.” compound sentence, there should be a comma after “realized.” complex sentence, there should be a comma after “inspiration.” compound sentence, there should be a comma after “found.”