Answer: def add integers (x, y): return x + y

## Explanation Let's analyze each option: **Option A**: Incorrect. Python uses `def` keyword to define functions, not `function`. This is JavaScript/other language syntax. **Option B**: Incorrect. While the function definition is correct (`def add_integers(x, y)`), it uses `print(x + y)` instead of `return x + y`. The function prints the result but doesn't return it, so it returns `None`. **Option C**: Incorrect. The function definition is correct but lacks a return statement. The expression `x + y` is evaluated but not returned, so the function returns `None`. **Option D**: **CORRECT**. This option has the correct function definition with `def` keyword and properly returns the sum using `return x + y`. Note that there's a typo in the function name (`add integers` instead of `add_integers`), but the question asks for a code block to complete the task, and this is the only one with correct Python syntax and proper return statement. **Key Python concepts**: - Functions are defined using `def` keyword - The `return` statement sends a value back to the caller - Without `return`, a function returns `None` - Function names cannot contain spaces in Python (though this appears to be a typo in the question)

Author: Keng Suppaseth