Sabrina and i were excited for the opening of the new bakery.
the doughnuts we bought were the best us had ever tasted!

the antecedent in this sentence does not match the underlined pronoun in

case
person
case and number
person and number

Sabrina and I were excited for the opening of the new bakery.  

The doughnuts we bought were the best us had ever tasted!  

The antecedent in this sentence does not match the underlined pronoun in case. Option A is correct.

Case refers to a special grammatical category of a noun, pronoun, adjective, participle or numeral which value reflects the grammatical function that the  word has in a sentence in a phrase, clause or sentence.

our democratic-republican government is based on the idea of the natural right of every individual member thereof to . . a vote in making and executing the laws.

explanation: