Read the sentence.

after we heard the way he played the song on his guitar, we bought it.

which analysis correctly identifies the pronoun error and solution?

the pronoun “we” should be changed to “us.”
the pronoun “he” should be changed to “they.”
the pronoun “his” should be changed to “himself.”
the pronoun “it” should be changed to “the song.”

The pronoun "it" should be changed to "the song"

Explanation: The last option is the only one which solves the ambiguity of the pronoun "it," whose antecedent in this sentence was not clearly defined and could have been "the guitar" or "the song." All the other options lead to invalid sentences: "we" is always a subject, not an object in this sentence (so it can't be changed to "us"), replacing "he" with "they" would break coherence with "his guitar" and the possessive pronoun "his" would lose its function if changed to the reflexive pronoun "himself".