一道GWD数学

QX:
If the probability is 0.54 that Stock A will increase in value during the next month and the probability is 0.68 that Stock B will increase in value during the next month, what is the greatest possible value for the probability that neither of these two events will occur?

0.22
A. 0.32
B. 0.37
C. 0.46
D. 0.63
Answer:

答案是B， 为什么不是0.46*0.32?

同问。

请大牛们给解答！@！~~

答案真的是B吗？为什么我算出来是D？1-0.54*0.68

请指教。。。