They found that in some people, this activity was reduced when the subjects participated in a competition as part of a group, compared with when they competed as individuals.
Those people were more likely to harm their competitors than people who did not
exhibit this decreased brain activity.
EXPLAIN THIS QUOTE PLZ

Explanation:

Researchers find that being in a group makes some people lose touch with their personal moral beliefs. When people get together in groups, unusual things can happen -- both good and bad. Groups create important social institutions that an individual could not achieve alone, but there can be a darker side to such alliances: Belonging to a group makes people more likely to harm others outside the group.

your answer will most likely be a.

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