Galileo was the first scientist to do which of the following? a. estimate the speed of light b. propose the heliocentric theory c. discover radioactivity d. define and measure speed e. invent the reflecting telescope

the answer is a. estimate the speed of light.

there is no correct list among the choices you've provided.

the list might look something like this:

-- baby human

-- piccolo

-- flute

-- soprano singer

-- trumpet

-- tenor singer

-- trombone

-- baritone singer

-- baritone horn

-- bass singer

-- tuba

since i had to make up the list myself, i made it easy on myself, and i didn't try to shuffle the string instruments and woodwinds into it too.