The correct answer is option C) Macro.

Explanation:
A macro is a type of instruction that can produce several lines of machine language code. It is a sequence of instructions that is given a name and can be invoked (called) multiple times throughout a program. When the macro is called, all the lines of code associated with the macro are executed.

Advantages of using macros:
1. Code Reusability: Macros allow the reuse of code. Instead of writing the same lines of code repeatedly, a macro can be defined once and then called whenever needed. This saves time and effort in writing and maintaining the code.

2. Readability: Macros improve code readability by providing meaningful names to a sequence of instructions. Instead of using complex and lengthy lines of code, a single macro call can represent the entire sequence of instructions, making the code more concise and easier to understand.

3. Easy Modification: If there is a need to modify the code, it can be done easily by changing the macro definition. This change will be reflected wherever the macro is called in the program, ensuring consistency and reducing the chances of errors.

4. Flexibility: Macros can accept parameters, allowing customization of the code based on different input values. This makes the code more flexible and adaptable to different scenarios.

Example:

Let's say we have a program that needs to perform a specific sequence of instructions multiple times. Instead of writing the same lines of code repeatedly, we can define a macro that encapsulates the instructions and give it a name.

For example, let's define a macro named "calculateSum" that adds two numbers and stores the result in a register:

```
MACRO calculateSum num1, num2
ADD R1, num1
ADD R1, num2
ENDMACRO
```

Now, whenever we need to calculate the sum of two numbers, we can simply call the macro by providing the values of num1 and num2 as arguments:

```
calculateSum 5, 3
```

This will expand to:

```
ADD R1, 5
ADD R1, 3
```

Thus, using macros allows us to write cleaner and more efficient code by reducing redundancy and increasing code reusability.