Aclosed loop through which current can flow is called a(n):
conductor
resistor
voltage source
circuit

A closed loop through which current can flow is called a "Circuit"

So, option D is your answer.

Hope this helps!

Ithink that the use of creativity in the sciences entails that one produce something out of nothing or from another thing. with this, i think that the he wrote down his results as four parts of the atomic theory is the manifestation of the  creativity of john dalton.