In a particular country in 2013, the average worker needed to work 29 hours to produce 59 units of output. In that same country in 2020, the average worker needed to work 31 hours to produce 73 units,
a) 2013, 29, 59
2020, 31, 73
b) 2013, 31, 73
2020, 29, 59
c) 2013, 31, 73
2020, 31, 73
d) 2013, 29, 59
2020, 29, 59