A farmer brings in machinery to assist workers during the harvest period. The farmer also cuts the number of workers by $50\%$. As a result, the total harvest rises by $25\%$. What has taken place?
- ALabour productivity has decreased and production has decreased.
- BLabour productivity has decreased and production has increased.
- CLabour productivity has increased and production has decreased.
- DLabour productivity has increased and production has increased.