They designed and built some of the early skyscrapers.
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This is called a complex reaction time. Since the response is for a multiple stimuli and response possibilities, it should be a complex one which relates to "many" or multiple. The total time to respond to a stimuli is called a reaction time. Thus, it represents a complex reaction time.
can you comment the answer choices?
The answer would be,
B. Create agencies with the authority to protect those rights
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