How did using metal help ancient Chinese people increase food production? It led to wet farming for rice.
It led to planting crops in rows.
It led to stronger plows for tilling.
It led to improvements in irrigation.

Thank you

Three major revolutionary improvements in farming took place between 722 and 481 BC, the cast iron tools, the beasts of burden to pull plows, and the large-scale harnessing of rivers as well as developing water conservation projects. Cast Iron was such an influential part of farming and changed the way Chinese farmers would use their tools forever.

I’m not sure but I think the answer is; it led to improvements in irrigation

The answer would be advertising.