Need health and medical help with Early Childhood Development

Interdisciplinary learning is?

A. Studying different disciplines separately and then putting them together.

B. Knowing one discipline well and applying the information to another discipline.

C. integrating two or more disciples to enhance learning in both areas.

D None of the above.

I am thinking C or D. I know it is an educational process in which two or more subject areas are integrated with the goal of fostering enhanced learning in each subject area. the disciples is what is throwning me off.