This doesn’t show that the group that attended support meetings lived longer, on average, than the other group. We have no reason to think that the people who attended support meetings who died within 10 years lived longer than the people who died in the other group.

Whether support meetings are standard doesn’t reveal anything about whether they are or are not effective in helping people live longer.

This constitutes evidence suggesting that the support group meetings might have helped people live longer. Even if an equal percent of people died in each group, the ones who attended the support meetings might have survived longer within that 10-year period.

It’s not clear how a decrease in faith in a treatment could affect the effectiveness of the treatment. In addition, (D) simply says some physicians have argued this; this doesn’t suggest those physicians are right.

It’s not clear whether these reports indicate that the meetings actually helped patients cope with the disease. In any case, this answer doesn’t suggest that better ability to cope increases one’s lifespan.