A quantity of matter with a fixed identity is
neither
the system
the surroundings

A certain source of 12V with an internal resistance of 1colomb is connected to 5colomb external resistance what is the current

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.