Concept:Each generation of computers is defined by the main electronic technology used in its circuits, and that technology changed the size, speed, and cost of computers.
Explanation:The first generation of computers used bulky vacuum tubes.
The second generation replaced vacuum tubes with smaller transistors.
The third generation used integrated circuits, which combined many components on one chip.
The fourth generation introduced microprocessors, where the entire central processing unit is built on a single chip.
This placed processing power, control, and logic in one compact unit, making computers far smaller and cheaper to produce.
As a result, microprocessors became widely used and made personal computers affordable.
The fifth generation later focused on artificial intelligence, not on introducing microprocessors.
Therefore, the generation connected with the widespread use of microprocessors is the fourth generation.
Answer:A. Fourth generation.