All of the Following Represent a Significant Drawback of Conducting

Multiple Choice

All of the following represent a significant drawback of conducting a longitudinal study EXCEPT

A) participants may drop out of the study for a variety of reasons.
B) participants may come to no longer comprise a representative sample of a population.
C) it can take a long time and cost a lot of money.
D) it is highly susceptible to the cohort effect.