Those who contend that oligopolists are less likely than more competitive firms to engage in R&D say that:

A. entry barriers enable oligopolists to sustain the profits they gain from innovation.

B. Oligopolists have little incentive to introduce costly new technology and produce new products when they currently are earning large economic profit using existing technology and selling existing products.

C. the large size of oligopolists' R&D departments allow them to use very specialized, expensive R&D equipment and employ teams of specialized researchers.

D. the undistributed profits of oligopolists give them a source of readily available, relatively low cost funds for financing R & D.