Final answer:
The keyword 'this' in Java is used within a method to refer to the current object receiving the method call.
Step-by-step explanation:
Within a Java method definition, a Java programmer may use the keyword this as a name for the object receiving the method call. The options provided are: a) This b) Super c) Object d) Class.
The correct answer is a) This. The keyword super is used to refer to a method or variable from the superclass of the object, and the keywords Object and Class are used to refer to the Object class and a class literal respectively, not the instance receiving the method call.