Lustrous non - metal is:

Explanation:

Lustrous is the property of metals which means they have a shinier surface.

Usually non-metals are non-lustrous.

They have a dull appearance.

Diamond and Iodine are the two non-metals which are lustrous.

They are exceptions.

Thus, option (D) is correct.

Final Answer:

Hence, option (D) is correct i.e. diamond and iodine.