Which of the following is true about longitudinal research? a. data are useless b. changes in the operational definitions the agencies use to specify key terms does not change overtime c. the procedures the agency uses to collect the data over time remain the same d. as the time interval under investigation increases, so does the potential for change in measurement.

Option D -- As the time interval under investigation increases, so does the potential for change in measurement.

Explanation:

Since longitudinal research or study focuses on change in behavior over time. Therefore, as the time interval under investigation increases, so does the potential for change in measurement. On this wise, the correct option is D. Option A, option B and Option C aren't best defined longitudinal research.

the united states has a federal government. the president is the head of the federal government of the united states. however, each state forms its government for administration purposes. the powers of the state governments are exercised within restricted state boundaries. and citizens participate in this government by voting.

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explanation: