Arthur holmes came up with his own theory of drifting continents in 1928. what was his theory?

Holmes proposed that Earth's mantle contained convection cells that dissipated radioactive heat and moved the crust at the surface. He called it Continental drift

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.

-4 on