Answer:
According to studies of human decision-making, the most likely is:
c. After reading the article, all members of the group oppose capital punishment.
Step-by-step explanation:
The article, provided for reading by supporters and opposers, will likely sway the 40% of the group, who are initially supportive of capital punishment, to now oppose capital punishment,especially if the article critically opposes capital punishment. There is no way majority of the group will support capital punishment. Therefore, options a and b are incorrect. For option d, after reading the article, the opinions of some opposers and supporters may shift either way. They will not remain the same as before. This rules out option d, leaving only option c as the correct option.