Answer :

Final answer:

The subject of the question 'My friend and I... at the library yesterday afternoon' requires the verb 'were' to match its plural form.


Explanation:

The correct option is (c) were as the subject 'My friend and I' is plural, so the correct verb to use is 'were.'


Learn more about Subject-Verb Agreement here:

https://brainly.com/question/29783458


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