[单选题]
When the first law ofndba0po :.q2(wni a6h1s9ly s 0 6e rmvqe,cfyjn+e a jz2vj1ys y8g2y* i0:7s thermodynamics, $Q = \Delta U + W$, is applied to an ideal gas that is taken through an isothermal process,
A. $\Delta U = 0$
B. $W = 0$
C. $Q = 0$
D. none of the above