Two-Thirds of Patients in a Drug Trial Suffered from Severe

Multiple Choice

Two-thirds of patients in a drug trial suffered from severe migraines as a side effect. Another side effect was impaired vision, with 25% of all patients having no impairment, 50% having some impairment, and 25% having severe impairment. Based on these probabilities, which of the following would be the correct tree diagram?

A)

B)

C) Both A and B are correct.
D) Neither A nor B is correct.