Question

1. which of the following did leonardo da vinci develop?

○ a calculator
○ a compass
○ a steam engine
○ a motor boat

Explanation:

Leonardo Da Vinci developed a compass (a type of geometric compass for measurement and drawing, different from the navigational compass in some contexts). A calculator was developed later, the steam engine's practical version was by James Watt, and motor boats came with the advent of internal combustion engines much later.

Answer:

B. a compass (Note: Assuming the options are labeled with letters, if the original options had labels like A, B, C, D with "a compass" as one, the answer would be the option with "a compass". If no letter labels, then the answer is "a compass".)