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The major obstacle in conducting longitudinal research is that

A

Observed differences in participants at different stages of life may be the result of differences in their environment.

B

Some participants may drop out for reasons that affect the conclusion of the study.

C

Older participants are disadvantaged because of unfamiliarity with testing conditions.

D

People change over their lifetime.

E

Differences in gender, race, and socioeconomic status cannot be accounted for.

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