Which one of the following pairs is an example of polar molecular solids?

Question

$\mathrm{HCl}(\mathrm{s}), \mathrm{AlN}(\mathrm{s})$

$\mathrm{MgO}(\mathrm{s}), \mathrm{SO}_{2}(\mathrm{s})$

$\mathrm{SO}_{2}(\mathrm{s}), \mathrm{NH}_{3}(\mathrm{s})$

$\mathrm{SO}_{2}(\mathrm{s}), \mathrm{CO}_{2}(\mathrm{s})$

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