Which of the following elements can be made into thin sheets? 

Metals have a glossy finish and are solid by nature. Metals have a high melting and boiling temperature as well as a high density. They have a resonant quality. Due to their malleability, they can be beaten at high temperatures and transformed into thin sheets.

Let's examine each possibility, in turn, to see if there is a metal present; if so, we may infer from the explanation above that it can be formed into thin sheets. As a result, we can draw the conclusion that, of all the possibilities presented, only zinc can be formed into thin sheets because it is the sole metal among the nonmetals presented—phosphorous, sulphur, and oxygen.

Hence, the correct answer is option A.