Answer:
d) correlational research
Explanation:
Because of the number of people in this study, researches have enough evidence for settle a relation among helping in different situations.
Correlational studies, are used in psychology to relate two or more variables. In this case, how is the behavior or disponibility of men and women in front of different events like helping animals, people in street, people in danger, etc.
A. Retrograde
B.Anterograde
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According to me he should choose Running in a 5K race, because when we run our lungs need much more air.