Step 1: Identify the subject.
The subject in the sentence is “You and I.” This is a plural subject because it refers to two people. Therefore, the verb must agree with a plural subject.
Step 2: Apply subject–verb agreement.
For plural subjects, the auxiliary verb “have” is used with the past participle form of the main verb. Hence, “have fulfilled” is grammatically correct.
Step 3: Analyze the options.
- (a) am fulfilled: Incorrect; “am” is used only with “I” alone, not with “You and I.”
- (b) has been fulfilling: Incorrect; singular form “has” does not match the plural subject.
- (c) have fulfilled: Correct; plural verb matches with plural subject “You and I.”
- (d) has fulfilled: Incorrect; “has” is singular.
Step 4: Constructing the correct sentence.
“You and I have fulfilled the obligations.”
Step 5: Conclusion.
Thus, the correct option is (c) have fulfilled.