Answer: D. Some of the professor's rules seem unfair.
Step-by-step explanation:
We are given the sentence "Some of the professor's rules seems unfair." however the verb "seems" has an incorrect agreement, so it is not correct. We will look through our given answer options and determine which is the correct answer.
✗ Some of the professor's rules seeming unfair.
A ➜ The use of a present participle is incorrect here.
✗ Some of the professor's rules is unfair.
B ➜ The verb "is" is incorrect here.
✗ Correct
C ➜ We already determined that "seems" is incorrect in the given sentence.
✓ Some of the professor's rules seem unfair.
D ➜ This option is correct! We have the correct verb here, "seem."
A tip for finding errors within subject-verb agreement is to read the sentence out loud as you would normally. We should say "...rules seem unfair" and not "seems." Subject-verb agreement means that if the subject is singular, the verb is singular (or both plural).