Answer: b) Retrospective measures
Explanation:
Retrospective measures is the approach in which past information and study is used for collecting samples and starting research about same topic.This helps in easy conduction of research with less amount of time.
According to question, anxiety related information in competition of sport team can be known through retrospective measure as it will provide the past data of anxiety states occurring in sports competition.
Other options are incorrect because prospective measure, physiological approach and brain waves are not used for knowing information through past studies.Thus, the correct option is option(b)
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