If a question says the machine was intended to prepare mathematical tables, which is the best match?

Correct answer: Difference Engine

The Difference Engine is the best match because Charles Babbage designed it primarily to calculate and print accurate mathematical tables, especially tables used in navigation, engineering and science. Its method was based on finite differences, which allowed repeated arithmetic operations without requiring ordinary multiplication and division at every step. The Analytical Engine was a later, more general design intended to be programmable and to contain features resembling a modern computer, so it is not the most precise answer when the clue is specifically mathematical tables. UNIVAC I was an early electronic general-purpose computer, while Mosaic was a web browser. Thus option A follows directly from the machine’s intended purpose.