I think you are right .. though drip irrigation checks erosion too…”The major causes of irrigation salinity include over-irrigation of farm land, inefficient water use, poor drainage.” Drip irrigation is used mainly to reduce (a) fertiliser input (b) water input and weed reduction, check salinity of soil which is caused by flood-irrigation. Soil erosion will come in last.
As Q has no option which includes all statement ..
so going with “weed reduction” and “soil salinity reduction” would be more appropriate.
Inspired by the Arab Spring uprisings taking place throughout the region, protests also occurred in Oman during the early months of 2011. Although they did not call for the ousting of the regime, demonstrators demanded political reforms, improved living conditions, and the creation of more jobs. They were dispersed by riot police in February 2011. Sultan Qaboos reacted by promising jobs and benefits. In October 2011, elections were held to the Consultative Assembly, to which Sultan Qaboos promised greater powers. The following year, the government began a crackdown on Internet criticism. In September 2012, trials began of 'activists' accused of posting "abusive and provocative" criticism of the government online. Six were given jail terms of 12–18 months and fines of around $2,500 each.