请各位帮忙确定一下答案，是 B 还是 C ？ Thx
70. Alow-pressure weather system is approaching Plainville;rainfall results from about 70 percent of such systems in the Plainville area. Moreover, the currentseason, spring, is the time of year in which thundershowers, which sometimesresult from low-pressure systems, are most likely to occur in Plainville.
Knowing whichone of the following, in addition to the information above, would be mostuseful for determine the probability that Plainvillewill have a thundershower soon?
A. the percentage ofthundershowers in Plainvillethat occur in the spring
B. the percentage of springrainfalls in Plainvillethat are thundershowers
C. the percentage ofthundershowers in Plainvillethat result from low-pressure systems
D. whether low-pressure systems inother areas are associated with rainfall
E. whether Plainville has more or fewer thundershowerseach spring than do near by towns
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