Which of the following contains a vague pronoun reference?

 - Dave gave a beautifully bound copy of his favorite book, One Hundred Years of Solitude, to Danny.
 - Dave gave Danny a beautifully bound copy of One Hundred Years of Solitude, which is his favorite book.
The first answer choice contains a vague pronoun reference. The pronoun his could refer to Dave or Danny.
Dave gave Danny a beautifully bound copy of One Hundred Years of Solitude, which is his favorite book.
The second answer choice shows a possible correction for the vague pronoun reference. The text has been rewritten so that the meaning is clear.
Dave gave a beautifully bound copy of his favorite book, One Hundred Years of Solitude, to Danny.