Consider a Volume of Gas in a Sealed Container $d W = p d V$

Multiple Choice

Consider a volume of gas in a sealed container. Assume that we do work on the gas by slightly compressing it (making the volume slightly smaller) . Recalling that the work that gas does on its surroundings is $d W = p d V$ , what is the sign of $d W$ in this case?

A) Negative
B) Positive
C) Zero
D) Cannot be determined