The answer is A. (Boring classes are just as important as interesting ones.)
I'd say 1.A
And 2.C are the correct answers
The correct personal pronoun to complete the sentence is the subject pronoun, C. I: "The funniest performers were Karl, Mike, and I.
The compound object "Karl, Mike, and I" is a subject complement.
A subject complement is a noun, a noun phrase, a pronoun, or an adjective that follows a linking verb to restate the subject of the sentence.
A linking verb acts as an equal sign, the subject is or becomes the object.
> performers = Karl, Mike, and I
A noun or a pronoun subject complement is called a predicate nominative.
A pronoun that functions as a subject complement (a predicate nominative) is always the subjective form.