Concept:Human resources are the driving force that manages every other business resource.
Explanation:Business resources include people, money, materials, and opportunities.
Of these, human resources are the most important because people plan, organise, direct, and control all other resources.
Without skilled human effort, money, materials, and opportunities cannot be effectively used.
Therefore, the success of a business depends mainly on the quality and effectiveness of its human resources.
Answer:Human resources (Option A).