Final answer:
The answer is d. this is an error because a Java method declared to return an int cannot return a double without explicit casting.
Step-by-step explanation:
The question is asking about the return type of a Java method. The method methodA performs an arithmetic operation with two double values and attempts to return a result of double type as an integer type. However, as Java is strictly typed, it will not automatically convert a double to an integer. Since the return type of the method is declared as int, trying to return a double will cause a compilation error. No conversion or casting is provided in the code, so the answer is d. this is an error.