Which of the following contains a vague pronoun reference?

 - Andy accidentally bumped into the waiter, and food splattered all over his shirt.
 - Andy accidentally bumped into the waiter, and food splattered all over Andy's shirt.
The first answer choice contains a vague pronoun reference. The pronoun his could refer to Andy's or the waiter's.
The second answer choice shows a possible correction for the vague pronoun reference. His has been replaced with Andy's.
Andy accidentally bumped into the waiter, and food splattered all over Andy's shirt.