Answer: A) formal discipline
Explanation:
In terms of transfer of learning ,formal discipline is defined as the theory that depicts studying mathematics can improve logical skills and thinking ability of a person.
According to the question,Mary's parents are using formal discipline concept to make Mary study advanced mathematics so that she can gain better logical thinking while rehearsing drama.
Other options are incorrect because specific transfers and processing of i formation are not the methods that is held by Mary's parents in terms of transfer.Thus, the correct option is option(A).