Adrug testing company advertises a test for steroids that is 92.1% effective at detecting steroid use. it has a true negative effectiveness of 90.6%.

which statement is true about the 90.6% rate?

a. the probability of someone not using steroids testing positive for steroids is 90.6%.
b. the probability of someone using steroids testing negative for steroids is 90.6%.
c. the probability of someone using steroids testing negative for steroids is 9.41%.
d. the probability of someone using steroids testing negative for steroids is 90.6%.
e. the probability of someone not using steroids testing positive for steroids is 9.41%.