Step 1:

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P-n junction diode:

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D. It has heavily doped p-type and n-type regions separated by an intrinsic region.

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Varactor diode:

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A. Its operation depends on the capacitance that exist at the p-n junction which is reverse biased.

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Tunnel diode:

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C. It has a negative resistance region where an increase in terminal voltage results in reduction in the diode current.

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Zener diode:

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B. It permits the current to flow in the forward bias direction but it will also flow in the reverse bias when  the voltage is above the breakdown voltage.

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Vp = 14 V

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