Correct Answer: Both assertions and reasons are correct, and the reason is the correct explanation of the assertion.

Solution : The correct answer is (a) Both assertions and reasons are correct, and the reason is the correct explanation of the assertion.

The assertion that scientific management principles aim to increase efficiency through job specialization is correct. Scientific management emphasizes breaking down work into specialized tasks to improve efficiency and productivity by allowing employees to focus on specific tasks.

The reason provided, stating that it allows employees to focus on specific tasks, leading to expertise, is also correct. Job specialization in scientific management does indeed enable employees to concentrate and become experts in their specific tasks, which enhances efficiency and productivity.