Final answer:
People are sometimes aware of the difficulty of a secondary task, depending on the task. Informational social influence is more likely when the answer is unclear and when the group has expertise. Without enough information, it's impossible to determine whether two concepts are mutually exclusive.
Step-by-step explanation:
Understanding whether people are aware of the difficulty of a secondary task, the closest answer would be c) Sometimes, depending on the task. Awareness of task difficulty is subjective and varies with individual perception, experience, and the complexity of the task. However, when it comes to informational social influence, this is more likely under certain conditions. According to the options provided, d) both b and c - when the answer is unclear and when the group has expertise - are conditions that enhance the likelihood of informational social influence, as individuals look to others for guidance when the situation is ambiguous and the group appears knowledgeable.
As for determining whether two concepts are mutually exclusive without sufficient information, the correct answer is D) Not enough information given to determine the answer. This statement underlines the necessity of adequate context to evaluate the relationship between concepts.