Concept:
This question explores the inclusive and secular nature of the performing arts. Art often acts as a bridge that transcends socio-political and religious boundaries because the focus remains on the aesthetic quality of the performance rather than the identity of the performer.
Step 1: Evaluating the Assertion.
In professional theatre, dance, and music, the selection of artists and their collaboration is based on talent and the requirements of the art form. Historically and in contemporary times, art has been a space where people of different genders and backgrounds collaborate freely. Thus, Assertion A is correct.
Step 2: Evaluating the Reason.
The collaborative nature of performing arts requires intense interaction and shared goals. This necessity for cooperation has historically made the art world more progressive and integrated than general society. Thus, Reason R is correct. Since this collaborative necessity is exactly why the barriers (sex, caste, creed) are diminished, R is the correct explanation for A.