Final answer:
To fix the run-on sentence "Juan tried to finish his book on time he left two chapters unread," the best options are B) adding a period to create separate sentences, and C) using the coordinating conjunction 'but' with a semicolon for a compound sentence. Both solutions split the original run-on into independent clauses that are grammatically correct.
Step-by-step explanation:
The sentence presented by the student is a run-on sentence, which is an error that occurs when two independent clauses (complete sentences) are not properly separated by punctuation or conjunctions. To fix the run-on sentence, one of the options is to add a period, creating two separate sentences. Therefore, the correct option is:
B) Juan tried to finish his book on time. He left two chapters unread.
This option splits the run-on sentence into two distinct sentences, each with its own subject and verb, and corrects the error. Options that add coordinating conjunctions, such as 'but', also fix the run-on. Thus, another correct option is:
C) Juan tried to finish his book on time but left two chapters unread; he did not have time to finish.
This uses a coordinating conjunction ('but') and a semicolon to join related independent clauses, forming a compound sentence that maintains the original meaning without being grammatically incorrect.