The correct option is: "plant rows of trees to serve as windbreaks"
The Soil Conservation and Domestic Allotment Act, passed in 1936, offered payments to farmers for transforming agricultural land with loss of soil into crops of legumes and grasses that promote soil conservation, and for implementing good agricultural practices in pastures. Measures that would have yielded more benefits if they had been adopted before the start of the drought cycle. The planting of more than 200 million trees from Canada to Abilene (Texas) was another measure taken by the New Deal administration.