Anna participates in a social psychological experiment in which she observes pairs of lights that are briefly turned on and off in a completely darkened room. although the distance between each pair of lights in the hex paradigm is always identical, the experimenter asks, "is the first pair of lights farther apart or closer together than the second pair? " this question, which implies that anna should perceive different spacing, illustrates the concept of a:

Demand characteristic

Explanation: Demand characteristic is the feature that produces a less valid or correct conclusion in a particular experiment by being biased. The experimenter of that experiment indirectly demands the participant to perform according to his expectations.

According to the situation in the question ,Anna is facing a situation of demand characteristic. Even though the spacing between the pair of lights are equal , experimenter raises the question regarding the less or more spacing present in between lights. This signifies that experimenter is expecting the answer of Anna to be according to her expectation.

answer; ///the declaration of independence;

because he had a big bear belly