Read the sentences from a report on Neil Armstrong.

Which sentence contains a pronoun error?

(1) Neil Armstrong was known for his actions and words as the first person to walk on the moon. (2) Watching that event on television, we heard the words, “That’s one small step for man, one giant leap for mankind.” (3) Thousands of Americans saw his fearlessly step down onto the powdery lunar surface. (4) Armstrong completed a challenge that we considered impossible.

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