When Patrick and Mary Anne First Got Married They Agreed

When Patrick and Mary Anne first got married they agreed to participate in a research project that investigates the happiness of married couples over time. Every five years they complete a survey that indicates their marital satisfaction. It is evident that Patrick and Mary Anne are:

A) subjects in a cross-sectional study.
B) participants in a longitudinal study.
C) subjects in a control condition.
D) participants in a single-blind study.

Correct Answer:

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