Answer: A is core competence
Explanation:
Core competence is the common term that is used by an organisation to define its multiple resources and skills that are not similar to any one else in the market. Core competence is also the strategic advantage that a business possess in the market.
The strength of the organisation helps it attract many customers and tap all the opportunities in the market at the right time to achieve success. The core competence of the organisation cannot be easily identified or imitated by the competitors in the market.