The correct answer is: A. IDE
An IDE, or Integrated Development Environment, is a software application that provides comprehensive facilities to computer programmers for software development. An IDE normally consists of a source code editor, build automation tools, and a debugger.
A toolbar is a bar that contains icons or buttons that can be used to perform actions. A menu bar is a bar that contains menus that can be used to select commands.
Neither a toolbar nor a menu bar is an IDE.