The  reason why digital computers use complemented subtraction is that it*(A) Simplifies the circuitry.(B) Is a very simple process.(C) Can handle negative numbers easily.(D) Avoids direct subtraction.

The reason why digital computers use complemented subtraction is because it simplifies the circuitry, can handle negative numbers easily, and avoids direct subtraction. This method is not necessarily simpler in process, but it is more efficient for digital computing systems.

Here's a step-by-step explanation:

1. Simplifies the circuitry: In digital computers, the same circuitry is used for both addition and subtraction, which simplifies the design and operation of the computer. This is achieved by using the concept of complemented subtraction.

2. Can handle negative numbers easily: Complemented subtraction allows digital computers to easily handle negative numbers. This is because the complement of a number can be used to represent its negative, which simplifies the process of subtraction.

3. Avoids direct subtraction: Direct subtraction would require additional circuitry and complexity in a digital computer. By using complemented subtraction, the need for direct subtraction is eliminated, making the process more efficient.

So, the correct answer is (A) Simplifies the circuitry, (C) Can handle negative numbers easily, and (D) Avoids direct subtraction.