288. For a pregnant woman, a certain test will give the outcome “not pregnant” with probability 0.10. For a non-pregnant woman, the test will give the outcome “pregnant” with probability 0.20. Of women who take the test, 20% are pregnant. Calculate the probability that a woman is pregnant, given her test outcome is “pregnant.” (A) 0.10 (B) 0.20 (C) 0.50 (D) 0.53 (E) 0.90