Last Year a Country Had 800 Workers Who Worked an Average

Last year a country had 800 workers who worked an average of 8 hours and produced 12,800 units.This year the country had 1000 workers who worked an average of 8 hours and produced 14,000 units.This country's productivity was

A) higher this year than last year.A possible source of this change in productivity is a change in the size of the capital stock.
B) higher this year than last year.A change in the size of the capital stock does not affect productivity.
C) lower this year than last year.A possible source of this change in productivity is a change in the size of the capital stock.
D) lower this year than last year.A change in the size of the capital stock does not affect productivity.