[单选题]
When the first law o623t r gglua ng q-s f49sxxqp2d6g63bf theo (8qnakvyi+ w;v/7m2yjh2 ntrmodynamics, $Q = \Delta U + W$, is applied to an ideal gas that is taken through an isobaric process,
A. $\Delta U = 0$
B. $W = 0$
C. $Q = 0$
D. none of the above