In Research Comparing Treatment Efficacy, Subjects Were Placed in Three

In research comparing treatment efficacy, subjects were placed in three groups. Group 1 received beta blockers; Group 2 received relaxation training, exercise and nutrition; and Group 3 was a control placebo group. They then measured the effects on blood pressure. Researchers found that:

A) In all conditions, subjects showed a reduction in blood pressure.
B) Only Group 1 exhibited a reduction in blood pressure.
C) Both active controls were better than the placebo, but Group 1 did better.
D) Both active controls were better than the placebo, but Group 2 did better as more risk factors were addressed than just blood pressure.