Final answer:
Polythink is characterized by excessive divergent thinking causing decision-making challenges, with signs including leaks of information, inability to reach decisions, and failing to revisit proposals; therefore, all provided options are signs of polythink. the correct Option a. failure to revisit earlier proposals.
Step-by-step explanation:
The term polythink refers to a situation in collective decision-making where there is an excessive amount of divergent thinking and opinions, often leading to confusion and inefficient decision processes. Answering which is a sign of polythink, option d. more leaks of information to outsiders is a likely sign as it indicates a lack of cohesion and control within the group. This leakage can stem from multiple conflicting perspectives within a team or organization that prevent forming a unified front, thus leading to outsiders gaining insight into the deliberation details which are supposed to be confidential.
Option a. failure to revisit earlier proposals reflects an inability to consider alternative solutions or learn from past efforts. Option b. inability to reach a decision can be a result of diverse opinions and indecisiveness, which are characteristic of polythink.