Indicate whether the data are a time series or a cross section.

Average diameter of trees processed inprocessed in a sawmill by each worker inby each worker in a yeara year.

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Part $1$

Choose the correct answer below.

A$.$

The data are a time seriestime series because the data are data measured over time.measured over time. nothing nothing nothing

B$.$

The data are a time series because the data are data 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 data measured over time.

D$.$

The data are a cross dash sectioncross$-$section because the data are data taken from situations that varytaken from situations that vary over time but are measuredover time but are measured at a singleat a single time instant.time instant.