The correct answer is: A. 8080 microprocessor.
The Intel MCS-80 is a family of 8-bit microprocessors introduced by Intel in 1974. The MCS-80 was the first microprocessor to be widely used in personal computers, and it was the basis for many early home computers, such as the Altair 8800 and the Apple I.
The MCS-80 was based on the Intel 8080 microprocessor, which was introduced in 1974. The 8080 was a revolutionary microprocessor, and it was the first microprocessor to be widely used in commercial products. The 8080 was used in a variety of products, including calculators, video games, and personal computers.
The 8080 was a 8-bit microprocessor, which means that it could process data in 8-bit chunks. The 8080 had a clock speed of 2 MHz, and it had 16 registers. The 8080 was also a relatively simple microprocessor, which made it easy to design and manufacture.
The 8080 was a very successful microprocessor, and it is considered to be one of the most important microprocessors ever made. The 8080 was the basis for many early personal computers, and it helped to launch the personal computer revolution.
The other options are incorrect because they are not microprocessors. The 8085 microprocessor was introduced in 1976, the 8086 microprocessor was introduced in 1978, and the 8082 microprocessor was introduced in 1979.