Indicate whether the data are a time series or a cross section.
Number of cars sold in a dealership each day in December.
Choose the correct answer below:
A. The data are time series because the data are measured over time.
B. The data are a cross section because the data are taken from situations that vary over time but are measured at a single time instant.
C. The data are a cross section because the data are measured over time.
D. The data are a time series because the data are taken from situations that vary over time but are measured at a single time instant.