The Support Worker Is About to Empty a Client's Ashtray

The support worker is about to empty a client's ashtray.Which of the following is correct?

A) The ashtray should be emptied into a wastebasket.
B) The ashtray should be emptied into a plastic container.
C) The ashtray should be emptied into a metal container that has sand or water.
D) The ashtray should be emptied only after the client is done smoking for the day.