I am not 100% on this but i think you would want a Large depth of field.
Answer:
A. Invention of microprocessor
Explanation:
The third generation of computer itself was based on the technology of integrated circuits (shorten as IC).
It lasted for about 6 years and was brought to an end with the advent of the fourth generation of computers which was based on microprocessors.
Hence, option A answers the question.
A characters introduction because a personal narrative is a thing written about a person/charector