What is the reason for this?

You are employed as a developer at ABC.com. You have been instructed to create a user
interface component for a new ABC.com application.
You are required to make use of an event programming construct.
What is the reason for this?

A.
It allows the user interface component the react to user actions.

B.
It prevents the user interface component from reacting to user actions.

C.
It allows the user interface component to send messages to the Event Log.

D.
It prevents the user interface component from sending messages to the Event Log.