A Manufacturer of Headache Medicine Claims It Is 70 Percent

A manufacturer of headache medicine claims it is 70 percent effective within a few minutes. That is, out of every 100 users 70 get relief within a few minutes. A group of 12 patients are given the medicine. If the claim is true, what is the probability that 8 have relief within a few minutes?

A) 0.001
B) 0.168
C) 0.667
D) 0.231
E) None of the choices are correct