Concept:Charles Babbage is the inventor credited with designing both the Difference Engine and the Analytical Engine.
Explanation:Charles Babbage began designing the Difference Engine in the 1820s as a mechanical calculator for tabulating polynomial functions.
In the 1830s, he designed the Analytical Engine, which was a general-purpose programmable computer.
Although neither machine was fully built during his lifetime, Babbage's designs laid the foundation for modern computers.
Ada Lovelace was Babbage's collaborator and wrote the first program intended for the Analytical Engine, but she did not invent the engines.
Blaise Pascal invented the Pascaline, an early mechanical calculator, in the 17th century, so he is not the inventor of these engines.
Therefore, the only correct option is the one that names Charles Babbage alone as the inventor of both machines.
Answer:D. Charles Babbage