The correct answer is: A. Events
An event is an action that occurs in a program, such as a mouse click, a keystroke, or a window being opened. Events are often used to trigger actions, such as opening a new window or playing a sound.
A function is a block of code that performs a specific task. Functions are often used to group related code together and to make code more reusable.
A procedure is a similar to a function, but it does not return a value. Procedures are often used to perform a task that does not need to be returned to the calling code.
An action is a general term that can refer to any type of event, function, or procedure. In the context of the question, the actions such as click, double-click, scrolling etc are events.