The correct answer is A. 8080.
The Intel 8080 is a 8-bit microprocessor that was first released in 1974. It was the first microprocessor to be widely used in personal computers, and it is considered to be the first microprocessor to start the microprocessor revolution.
The 8080 was designed by Marcian Hoff, Federico Faggin, Stanley Mazor, and Masatoshi Shima. It was based on the earlier Intel 4004 microprocessor, but it was much faster and more powerful. The 8080 had a clock speed of 2 MHz, and it could execute up to 250,000 instructions per second. It had 8 registers, and it could address up to 64 kilobytes of memory.
The 8080 was used in a number of early personal computers, including the Altair 8800, the IMSAI 8080, and the Apple I. It was also used in a number of early video game consoles, including the Magnavox Odyssey and the Atari 2600.
The 8080 was a revolutionary microprocessor, and it is considered to be one of the most important inventions of the 20th century. It paved the way for the development of personal computers and video game consoles, and it had a profound impact on the way we live and work.
The other options are incorrect because they are not the first device by Intel that started the microprocessor revolution. The 8086, 8087, and 8088 were all released after the 8080, and they were not as widely used.