The key to achieving competitiveness, earning above-average returns, and remaining ahead ofcompetitors in the long run is to manage current core competencies:

(A) in a way that uniquely bundles and leverages the firm's existing resources. (B) while simultaneously developing new ones. (C) and imitate the core competencies of successful competitors. (D) in order to preserve and enhance them against the firm's competitors.

(B). while simultaneously developing new ones.

Explanation:

Core competencies are the resources and capabilities an organization has that makes it stand out from its competitors.

An organization must combine its available resources and capabilities with the opportunities that exist in the environment, in order to gain competitive advantage over its competitors.

To remain ahead of the competitors in the long run, the organization must properly manage the core competencies it already has while trying, at the same time, to develop new ones.