The Canadian Longitudinal Study on Aging (CLSA-ELCV) is a longitudinal study surveying approximately 1,000 individuals in Canada to glean extended trends in aging. To carry out the necessary sampling of the population over many years, CLSA-ELCV needs extensive financial support, but this method provides valuable insights into causal relationships. However, when questions of causation are irrelevant, as with a fitness study seeking only to reveal the percentage of regular exercisers in a city who do weight training, longitudinal methods are unnecessary, and so
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mediumWhich choice most logically completes the text?
A
the success of the fitness study likely requires significantly less financial outlay than that needed for CLSA-ELCV.
B
the expense of CLSA-ELCV is likely greater than the cost of longitudinal studies of fitness.
C
longitudinal methods are suitable for studies of aging but ought to be avoided for those of fitness.
D
conclusions drawn from CLSA-ELCV are likely to be more authoritative than those from the fitness study.