Heres your great lovley answer that you need
C is correct. Only a closed circuit can carry current, opening a switch disconnects the circuit and stops current from flowing. Remember, all current flows in loops, if you can't make a loop out of it, current can't flow, and opening a switch, assuming no other paths for current exist, will completely stop the current.
During convection of air currents, cool air sinks. <em>(b)</em>
I dont really know but i think the first one is true super sorry
