Explanation:

The anchorage value of a hook refers to the capacity of the hook to resist the tensile forces acting on it and prevent the bar from slipping out of the hook. The anchorage value is usually expressed as a multiple of the diameter of the bar.

According to the given information, the anchorage value of the hook is assumed to be 16 times the diameter of the bar. This means that the hook is designed to provide a sufficient grip on the bar to resist the tensile forces, which are assumed to be 16 times the diameter.

However, the question asks for the angle of the bend, which is not provided. The angle of the bend plays a crucial role in determining the anchorage value of the hook. The angle of the bend affects the distribution of stress along the hook and the bar, and it can significantly influence the anchorage capacity.

Since the angle of the bend is not given, it is not possible to determine the correct answer. Therefore, the correct answer is option 'D' (None of these).

Without the specific angle of the bend, it is not possible to calculate the precise anchorage value of the hook. The angle of the bend can vary depending on the specific design requirements, code provisions, and engineering judgment. It is important to consult the relevant design standards and guidelines to determine the appropriate anchorage length and angle of the bend for a given application.

In summary, the anchorage value of a hook is assumed to be 16 times the diameter of the bar, but without the specific angle of the bend, it is not possible to determine the correct answer. The angle of the bend is a critical factor in determining the anchorage capacity of the hook and should be determined based on design standards and engineering judgment.