Correct Answer: D

The question asks for a Python function that:

• Takes two integers as input (x and y)
• Adds them together
• Returns the sum (so the result can be used later)

Let’s analyze each option:

A: Incorrect

function add_integers (x, y):
    return x + y

function add_integers (x, y):
    return x + y

• Python does not use the keyword function.
• The correct keyword to define a function in Python is def.
• This code will raise a SyntaxError.

B: Incorrect

def add_integers (x, y):
    print(x + y)

def add_integers (x, y):
    print(x + y)

• This defines a function correctly using def.
• However, it uses print() instead of return.
• print() only displays the result on the screen but does not return the value.
• If you call the function, you cannot use the sum for further calculations (e.g., result = add_integers(3, 5) would make result equal to None).

C: Incorrect

def add_integers (x, y):
    x + y

def add_integers (x, y):
    x + y

• This defines a function but has no return statement.
• In Python, if a function reaches the end without a return, it implicitly returns None.
• The expression x + y is calculated but immediately discarded. The function does nothing useful.

D: Correct ✅

def add_integers (x, y):
    return x + y

def add_integers (x, y):
    return x + y

• Uses the correct def keyword to define a function.
• Accepts two parameters (x, y).
• Uses return to send the sum back to the caller.
• This is the standard and correct way to write such a function in Python.

Example Usage of Correct Code (Option D)

result = add_integers(10, 25)
print(result)   # Output: 35

result = add_integers(10, 25)
print(result)   # Output: 35

Key Takeaways for the Exam

• Always use def to define Python functions.
• Use return when you need the function to produce a value that can be assigned to a variable or used further.
• print() is for displaying output only — it does not return a value.
• Missing return or using the wrong keyword (function instead of def) are common traps in certification questions.