Final answer:
The sentence that has a compound subject is: 'While most pre-med students major in the sciences, some choose majors such as English or philosophy.'
Step-by-step explanation:
The sentence that has a compound subject is: 'While most pre-med students major in the sciences, some choose majors such as English or philosophy.'
A compound subject is when a sentence has two or more subjects that share the same verb. In this sentence, 'pre-med students' and 'some' are the two subjects.
Another way to identify a compound subject is to look for conjunctions like 'and' or 'or' that join two or more subjects together in a sentence.
Learn more about Identifying compound subjects in sentences