The King

The architect mentions that the amendments were made by the King himself. Here's an explanation of this answer:

Context
In the given question, we are referring to a specific architect who made amendments. The context suggests that this architect was involved in a project, possibly the construction of a building or monument.

Architect's Role and Responsibility
As an architect, it is the professional responsibility to design and oversee the construction of a project. This involves creating the initial plans, coordinating with builders and craftsmen, and ensuring that the project meets the required specifications.

The Amendments
The question mentions that amendments were made, indicating changes or modifications to the original plans. Amendments can occur for various reasons, such as budget constraints, changes in requirements, or aesthetic preferences.

Identification of the Amender
According to the given options, there are four possibilities for the entity responsible for making the amendments. Let's evaluate each option:

a) The King: This option suggests that the King himself made the amendments. In historical contexts, it is not uncommon for rulers or monarchs to be involved in architectural projects and have the authority to make changes.

b) The chief of the builders: While the chief of the builders may have some authority over the construction process, it is unlikely that they would have the power to make significant amendments without consulting the architect or other higher authorities.

c) He himself: This option refers to the architect making the amendments. While architects can make changes to their own plans, it is unusual for them to be solely responsible for making amendments without any external influence or approval.

d) The masons: Masons are skilled craftsmen who work on the construction site under the guidance of the architect. They usually do not have the authority to make amendments as they primarily execute the plans provided by the architect.

Conclusion
Considering the context and evaluating the given options, it is most logical to conclude that the amendments were made by the King. Monarchs often have significant influence and decision-making power over architectural projects, making them the most likely entity to make amendments without consulting others.