Which would result a farmer in producing more food at a lower cost? planting wheat that is resistant to weed killer breeding pear trees that grow sweeter fruits growing rice that only grows in warm climates producing vegetable oil that has added vitamin a

planting wheat that is resistant to weed killer.(because you can just use weed killer and you wont destroy your crops creating more supply rather than not using wheat that will be destroyed by weed killer having low supply because half your crops died.)

Option A

Explanation:

The farmer will get maximum benefit when the farmer will have a wheat resistant to weed killer. The main benefit of this wheat will be that the wheat will not be destroyed even in the presence of weed killer.

This will increase the production of wheat as it will grow in large number. In case of normal wheat plant when the weed killers are sprayed on the field then half of the wheat plant dies because of weed killer.

Hence, the correct answer is option A.