Computers have evolved from the early mainframes to the relatively small smart devices with high computing power used today. Which of the following inventions contributed to reduce the physical size of computers?

Correct option is B

Integrated circuits (ICs) significantly reduced the physical size of computers by integrating multiple electronic components onto a single chip, replacing the bulkier vacuum tubes used in earlier computers. This invention was key to the miniaturization of computers.
Information Booster:
1. Integrated circuits combine multiple transistors, resistors, and capacitors into a small, compact form, leading to faster, smaller, and more reliable computers.
2. Vacuum tubes, used in the first-generation computers, were much larger and consumed more power.
Additional Knowledge:
· Solid state memory and registers are essential for modern computing, but they did not contribute as much as ICs to reducing the size of computers.