A Farmer Notices That a Crop Is Not Growing Well

A farmer notices that a crop is not growing well and suspects that the problem is the soil. Samples are tested and the soil is shown to contain normal amounts of salt. Testing also shows low levels of many plant nutrients. Based on these results, what may be causing the issues?

A) lack of topsoil
B) poor infiltration of water to the soil
C) salinization of the soil
D) leaching of the soil