Black soil is-

Option (b) is correct because black soil is swampy as it has more water holding capacity and it also has moisture retentive power.

Option (a) is not correct because black soil cannot be easily displaced because it is moisture retentive.

Option (c) is not correct because slag is the glass like by product left over after a desired metal from its raw ore.

Option (d) is not correct because black soil does not get leached because it is moisture retentive.