The correct answer is: A. Fabricated on a tiny silicon chip.
An integrated circuit (IC), also known as a microchip, is a small electronic circuit that contains many tiny transistors and other electronic components. ICs are used in a wide variety of devices, including computers, cell phones, and cars.
ICs are fabricated on a tiny silicon chip, which is a thin slice of semiconductor material. The chip is then etched with a pattern of tiny circuits, which are then filled with metal to create the actual electronic components.
ICs are much smaller and more complex than individual transistors. This makes them much more efficient and cost-effective to manufacture. ICs have revolutionized the electronics industry, and they are now used in virtually every electronic device.
Options B, C, and D are incorrect because ICs are not necessarily complicated, costlier than a single transistor, or integrating devices.