Step 1: Understanding Amaya Web Editor.
Amaya is a web browser and web editor that was designed to demonstrate and test web standards. It allows users to create, edit, and browse web pages using standard technologies such as HTML, CSS, and XML.
Step 2: Role of W3C.
The World Wide Web Consortium (W3C) is an international organization responsible for developing web standards that ensure the long-term growth of the web. W3C was founded by Tim Berners-Lee, the inventor of the World Wide Web.
Amaya was developed by the W3C to serve as a test platform for new web technologies. It helps developers verify how standards such as HTML and CSS should be implemented correctly in browsers.
Step 3: Evaluating the options.
(A) X3C: Incorrect. This is not a real organization related to web standards.
(B) Y3C: Incorrect. This option does not correspond to any web development standards body.
(C) Z3C: Incorrect. This is also not related to the development of web technologies.
(D) W3C: Correct. The World Wide Web Consortium developed the Amaya web editor to support and test web standards.
Step 4: Conclusion.
Therefore, the Amaya web editor was developed by the World Wide Web Consortium (W3C).
Final Answer: W3C.