Which one of the given options is correct with respect to the return statement of the...

The function h takes a function pointer p that accepts two integers and returns an integer, along with two integer parameters x and y. To invoke the function pointed to by p and return its result, we must dereference the pointer and call it with the correct arguments: (* p) (x, y). This dereferences the pointer to get the function, then calls it with x and y as arguments, returning the integer result.

Step-by-step Derivation:

1. Analyze the function signature: int h (int (* p)(int, int), int x, int y);

   • Return type: int
   • Parameter p: pointer to a function that takes two int arguments and returns int
   • Parameters x, y: two integers

2. Evaluate each option:

   • A) return *p; — Dereferences the function pointer but doesn't call it. Returns a function pointer (type mismatch; function pointers cannot be directly returned as int).
   • B) return (* p) (x, y) (*x, *y); — Syntax error. Attempts to call the result of (* p) (x, y) with (*x, *y), which is invalid. Also, *x and *y dereference integers (meaningless).
   • C) return 0; — Valid but ignores the function pointer and parameters entirely; not the intended use.
   • D) return (* p) (x, y); — Dereferences p to get the function, calls it with arguments x and y, and returns the integer result. Matches the function's return type.

3. Correct answer: D — This is the only syntactically correct and semantically appropriate way to invoke the function pointed to by p and return its result.