Verified Answer :

Felix101


The answer is (D) a cell

Hope this helps!

AL2006

Without a cell to supply energy, or a component such as a bulb to dissipate it,
and some connecting wire, you couldn't make a circuit.

But you could make one without a switch. 

(The only problem then would be that you could not turn off the bulb,
and you couldn't get any sleep until the cell runs down. :-) )

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