Concept:Remuneration is the direct financial reward paid to labour for its contribution to production.Explanation:Labour is human effort used in production.Workers are mainly motivated by what they receive in return for their work.Profit is the reward for the entrepreneur, not labour.Training and promotion can improve morale, but they are secondary incentives.The primary motivating factor for labour as an input is remuneration, which includes wages and salaries.Answer:C. remuneration