To answer this question, you need to understand the concept of constructors in Java.
Let's go through each option to understand why it is correct or incorrect:
Option A) Name - This option is incorrect because the name of the constructor is not an error. In Java, the name of the constructor must match the name of the class. However, since the class name is not provided in the question, we cannot determine if the name is correct or not.
Option B) Formal parameters - This option is incorrect because the absence of formal parameters in the constructor is not an error. Constructors can have formal parameters, but they can also be parameterless.
Option C) Return type - This option is correct because constructors do not have a return type. In the given code, the constructor is declared with the return type "int", which is incorrect. Constructors should not have any return type specified.
Option D) No errors - This option is incorrect because there is an error in the given code. The error is in the return type of the constructor. Constructors should not have a return type specified.
The correct answer is C) Return type. This option is correct because constructors do not have a return type specified.