Answer:
Adam found a pair of sunglasses, and he returned it to Alex.
Explanation:
The other answers have vaguer pronouns that could refer to either party (e.g.: 'She ate [the cake]'--did Abby or Ally eat it??).
Aston challenged Aiden to a tennis match, and he won.
How can you identify a precise pronoun?
What are precise pronouns?
For further information regarding Pronouns:
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