[单选题]
A container of ideal gas at Sh q7 zmlmdvrg73w d ,ek-xlc)/)mky 6ji7jb)+TP undergoes an isothermal expansion and its entrog x8td1v hn),ot49x atpy changet8d)xa,1x 9v4ttoh gn s by 3.7 J/e K. How much work does it do?
A. zero
B. $1.0 \times 10^{3} \; J/K$
C. $-1.0 \times 10^{3} \; J/K$
D. none of the above
