A data set is a balanced panel if it _____.
A. consists of a sample of individuals, households, firms, cities, states, countries, or a variety of other units, taken at a given point in time
B. consists of observations on a variable or several variables over time
C. consists of data for each cross sectional units over the same time period
D. consists of time-demeaned data for different cross sectional units
Answer: C
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