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A forward biased diode is :-
A
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B
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C
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D
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Detailed Solution
A p-n junction diode is forward biased when its p-side (anode) is at a higher potential than its n-side (cathode).
In every option the p-side is the left terminal and the n-side is towards the right terminal.
Left $-4$ V, right $-3$ V: the p-side is at the lower potential, so the diode is reverse biased.
Left 3 V, right 5 V: the p-side is at the lower potential, so it is reverse biased.
Left $-2$ V, right $+2$ V: the p-side is at the lower potential, so it is reverse biased.
Left 0 V, right $-2$ V: the p-side (0 V) is at a higher potential than the n-side ($-2$ V), so the diode is forward biased.
So the forward biased diode is the one with its left end at 0 V and its right end at $-2$ V.
In every option the p-side is the left terminal and the n-side is towards the right terminal.
Left $-4$ V, right $-3$ V: the p-side is at the lower potential, so the diode is reverse biased.
Left 3 V, right 5 V: the p-side is at the lower potential, so it is reverse biased.
Left $-2$ V, right $+2$ V: the p-side is at the lower potential, so it is reverse biased.
Left 0 V, right $-2$ V: the p-side (0 V) is at a higher potential than the n-side ($-2$ V), so the diode is forward biased.
So the forward biased diode is the one with its left end at 0 V and its right end at $-2$ V.