Which of the following scenarios describes a closed circuit?
a. A lightbulb with two wires attached to it, one going to the positive end of a battery and one
going to the other positive end of the same battery.
b. A lightbulb with two wires attached to it, one going to the positive end of a battery and one
going to the negative end of the same battery.
c. A lightbulb with two wires attached to it, one going to the positive end of a battery and one
going to the negative end of a dead battery.
d. A lightbulb with one wire attached to it, with only one piece going to the positive end of the
battery