The correct answer is: C. 80386
The IBM PS/2 model-80 was released in 1987 and used the Intel 80386 microprocessor. The 80386 was a 32-bit microprocessor that was significantly faster than the 80286 microprocessor that was used in the IBM PC/AT. The 80386 also had a number of new features, such as a protected mode operating system, that made it more powerful than previous microprocessors.
The 8088 microprocessor was a 16-bit microprocessor that was used in the original IBM PC. The 8088 was not a 32-bit microprocessor, and it was not powerful enough to run the operating system that was used in the IBM PS/2 model-80.
The 80286 microprocessor was a 32-bit microprocessor that was used in the IBM PC/AT. The 80286 was more powerful than the 8088, but it was not as powerful as the 80386. The 80286 also did not have a protected mode operating system, which made it less powerful than the 80386.
The 80486 microprocessor was a 32-bit microprocessor that was released in 1989. The 80486 was faster than the 80386, but it did not have any new features that made it more powerful than the 80386.
Therefore, the correct answer is: C. 80386