Which of the following contains a vague pronoun reference?

 - If Tommy doesn't know how to make homemade waffles, he can find it in the cookbook.
 - If Tommy doesn't know how to make homemade waffles, he can find the recipe in the cookbook.
The second answer choice contains a vague pronoun reference. The pronoun it is used without its antecedent.
The first answer choice shows a possible correction for the vague pronoun reference. It has been replaced with the recipe.
If Tommy doesn't know how to make homemade waffles, he can find the recipe in the cookbook.