What is one component of sustainable management of rangelands? 

A)  increased livestock grazing in underutilized areas 
B)  reduced grazing fees 
C)  no or limited grazing on riparian areas 
D)  elimination of riparian areas

No or limited grazing on riparian areas is a component of sustainable management of rangelands because riparian areas are important for biodiversity and water quality, and overgrazing can cause damage to these sensitive areas. Increased grazing in underutilized areas (A) could also cause damage to those areas as well as potentially leading to overgrazing overall. Reduced grazing fees (B) may be a way to incentivize sustainable grazing practices, but alone it is not a component of sustainable management. Elimination of riparian areas (D) would not be a sustainable management practice.