Consider each of the following examples data sets. Write two or three sentences explaining the form of the data (cross-sectional, time series, pooled cross-section/times series, panel or longitudinal) and the units of each variable.

A) Average wages ($ per month) of all female employees for 2018 for the Big 5 banks of Canada (CIBC, Bank of Montreal, Scotiabank, RBC, TD Bank);

B) Monthly excess returns on an index of 104 stocks in the sector of cyclical consumer goods in the UK in percentages over the period 1980 to 1999;

C) Annual data from 2002 to 2019 for 106 countries on the emissions of carbon dioxide (CO_2) in metric tonnes;

D) 2722 randomly selected Ethiopian rural households from the 6th (2004) and 7th (2009) rounds of the Ethiopian Rural Household Survey on a yes/no response to whether the household was able to meet the minimum amount of food needed for a healthy life over the preceding 3 months prior to the survey.