Question: What is one benefit of declaring the parameter as a `const` reference instead of declaring it as a regular object?

1. Actually, objects cannot be passed as regular variables, because they require a constructor call. Therefore, a `const` reference is the only way to pass class instances to functions.
2. There are no benefits because a reference and an object are treated as the same thing.
3. The `const` qualifier Forbids the code to modify the argument, so the programmer can rest assured that the source object will remain unchanged.
4. The argument is passed as a reference, so the Function receives a copy that can be modified without affecting the original variable.

Answer: The correct answer of the above question is Option C:The `const` qualifier Forbids the code to modify the argument, so the programmer can rest assured that the source object will remain unchanged.