Final answer:
When a group of people stop discussing an important decision due to fear of argument, the outcome is in danger of suffering from groupthink.
Step-by-step explanation:
When a group of people stop discussing an important decision for fear of an argument between two members, the outcome of that decision is in danger of suffering from groupthink. Groupthink is the modification of the opinions of members of a group to align with what they believe is the group consensus. It occurs when individuals prioritize maintaining harmony and conformity within the group over critical thinking and expressing dissenting opinions. In this situation, the group tends to make decisions without considering all viewpoints and potential alternatives, leading to potential negative consequences.