Which Strategy Would Greg and Raquel Massa NOT Apply in Managing

Which strategy would Greg and Raquel Massa NOT apply in managing their farm,given their conversion to sustainable agriculture?

A) planting native oak trees along field borders as a windbreak
B) using transgenic golden rice seeds that are nutritionally enhanced to produce vitamin A
C) introducing ducklings into rice paddies as a natural weed control
D) building nest boxes for wood ducks,barn owls,and bats so that these wild animals will keep pests in check
E) installing a recirculation system to reclaim and reuse irrigation water