What aspect of job design focuses on enhancing the intrinsic reward of the job?

C. Job enrichment is the correct answer because it specifically aims to enhance the intrinsic rewards associated with a job. This concept involves redesigning a job to increase an employee's motivation and satisfaction by providing them with more meaningful tasks, greater responsibility, and opportunities for personal growth. Job enrichment focuses on motivating employees by making work more rewarding and engaging, which can lead to heightened job satisfaction and improved performance.

The other concepts, while related to job design, do not primarily target intrinsic rewards in the same way. Job rotation involves moving employees between different tasks or roles to enhance their skill sets and reduce monotony. Job specification outlines the qualifications and responsibilities associated with a job rather than the enrichment of the job itself. Job enlargement expands the scope of a job by adding more tasks at the same level of complexity, but it does not inherently increase the depth of engagement or personal fulfillment in the work. Therefore, job enrichment stands out as the primary approach focused on enhancing intrinsic motivation in the workplace.