Can someone explain why the answer is 0.81. I thought you just do the use the conditional probability chain rule but I can't seem to get the answer. Please show all working out.

Figure 13: A Bayesian network G 39. Consider the Bayesian network model G in Figure 13 and calculate the following conditional probability (rounded to two decimal places) P(c0s0,d0,a0)= A. 0.34 B. 0.78 C. 0.02 D. 0.81 E. none of the above answers is correct