Briefing Android Knowledge

What does “this” keyword refer to in the following line of code?

What does “this” keyword refer to in the following line of code?
IabHelper mHelper = new IabHelper(this, base64EncodedPublicKey);

A.
The Context of the activity.

B.
Another instance of IabHelper.

C.
The current IabHelper.OnIabSetupFinishedListener interface.

D.
The Google Play developer console activity.