A farmer hired a soil specialist to analyze his soil. The specialist reported that the soil pH was 5, which was below the appropriate range to grow crops. The specialist recommended a soil treatment to the farmer. After taking the advice of the soil specialist, the soil's pH was measured to be 7. According to the information, what sustainable practice was likely used to alter the soil conditions?
A) Addition of limestone Eliminate
B) Addition of nitrogen fertilizer
C) Addition of phosphorus fertilizer
D) Addition of drip irrigation lines