Which sentences correct the vague pronoun problem in the sentence? Check all that apply.
He kept pace with his brother as they were running
around the track until he became too tired and had
to stop
Until Joe became too tired and had to stop, he kept
pace with his brother as they were running around
the track
Joe kept pace with him as they were running around
the track until he became too tired and had to stop
Until he became too tired and had to stop, he kept
pace with his brother as they were running around
the track
Until his brother became too tired and had to stop,
Joe kept pace with him as they were running
around the track