Question

Joy helped herself to some turkey. a. reflexive b. intensive

Answer 1

The other person is incorrect - the correct answer is A. reflexive.
There is a huge difference between reflexive and intensive pronouns, even though they look the same. Reflexive pronouns are used when the subject and the object of the sentence are the same - Joy helped whom? She helped herself.
On the other hand, intensive pronouns are used to place emphasis on the subject. For example: She did it herself. 

Answer 2

It should be b intensive.