Two Researchers Measure Attitudes Toward Capital Punishment in the Year

Two researchers measure attitudes toward capital punishment in the year 2000 and again in the year 2005. One researcher uses a panel study design (the same persons are questioned in 2000 and in 2005) ; the other uses a trend study design (different samples from the population are questioned in 2000 and 2005) . In analyzing the data that was collected,

A) both researchers should use paired-sample t tests
B) both researchers should use independent-samples t tests
C) the panel study researcher should use paired-sample t tests but the trend study researcher should use independent-samples t tests
D) the panel study researcher should use independent-samples t tests but the trend study researcher should use paired-samples t tests