The correct answer is A. Jack Kilby.
Jack Kilby was an American electrical engineer and inventor who invented the integrated circuit (IC) in 1958. He was awarded the Nobel Prize in Physics in 2000 for his invention.
Clive Sinclair was a British inventor and entrepreneur who is best known for inventing the Sinclair ZX Spectrum home computer. He was not involved in the invention of the IC.
John Napier was a Scottish mathematician and astronomer who is best known for inventing logarithms. He was not involved in the invention of the IC.
Steve Wozniak was an American computer engineer and co-founder of Apple Inc. He was not involved in the invention of the IC.
Herman Hollerith was an American inventor and statistician who is best known for inventing the punched card tabulating machine. He was not involved in the invention of the IC.
The IC is a miniaturized electronic circuit that integrates thousands or millions of transistors on a single chip. It is a fundamental building block in modern electronics and has revolutionized the way we live and work.