Question: b) Are these data a time series, or are these cross-sectional? Explain briefly. Choose the correct answer below. A. These data are cross-sectional. All variables

b) Are these data a time series, or are these cross-sectional? Explain briefly. Choose the correct answer below. A. These data are cross-sectional. All variables were measured at different times. B. These data are cross-sectional. All variables were measured at about the same time. C. These data are a time series. All variables were measured at different times. D. These data are a time series. All variables were measured at about the same time

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