For extrinsic semiconductors; when doping level is increased;

Options

AFermi-level of $p$ and $n$ - type semiconductors will not be affected.
BFermi-level of $p$ -type semiconductor will go upward and Fermi-level of $n$ -type semiconductors will go downward.
CFermi-level of both p-type and n-type semiconductors will go upward for $T > {T}_{F}K$ and downward for $T < {T}_{F}K,$ where ${T}_{F}$ is Fermi temperature.
DFermi-level of $p$ - type semiconductors will go downward and Fermi-level of $n$ - type semiconductor will go upward.

Correct answer

D. Fermi-level of $p$ - type semiconductors will go downward and Fermi-level of $n$ - type semiconductor will go upward.

Step-by-step solution

In n-type semiconductor pentavalent impurity is added. Each pentavalent impurity donates a free electron. So the Fermi-level of $n$ -type semiconductor will go upward.
& In p-type semiconductor trivalent impurity is added. Each trivalent impurity creates a hole in the valence band. So the Fermi-level of p-type semiconductor will go downward.

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