Which of the following contains a vague pronoun reference?

 - Colonel Tom Parker was Elvis Presley's manager until Presley's death in 1977.
 - Colonel Tom Parker was Elvis Presley's manager until his death in 1977.
The first answer choice contains a vague pronoun reference. The pronoun his could refer to Colonel Tom Parker or Elvis Presley.
The second answer choice shows a possible correction for the vague pronoun reference. His has been replaced with Presley's.
Colonel Tom Parker was Elvis Presley's manager until Presley's death in 1977.