Step 1: Recall where Class II sits in the eight-class capability system.
The land capability classes run from Class I, land with almost no limitations, through to Class VIII, land unfit for any cultivation and best kept under permanent forest or wildlife use. Class II land has some limitations that call for moderate conservation practice but is still quite suitable for regular cultivation, so it sits close to the good end of the scale.
Step 2: Test statements A and B against that position.
Statement A says Class II land requires moderate conservation practices, the textbook description of Class II specifically, so it is true. Statement B says Class II land has a gentle slope, consistent with a class this close to the top of the scale not carrying a steep slope limitation, so it is true.
Step 3: Test statements C, D and E.
Statement C claims severe salinity, but severe hazards of any kind are reserved for the far lower classes, such as V through VIII, not Class II, so C is false. Statement D claims slight to moderate salinity, mild enough to be consistent with a Class II soil needing only moderate conservation care, so D is true. Statement E claims permanent forest use, which is characteristic of the most limited Class VIII lands, not Class II, so E is false.
Step 4: Combine the findings.
A, B and D hold while C and E belong to far more restricted classes, so only A, B and D correctly describe Class II.
\[ \boxed{(A), (B) and (D) only.} \]