Grade A (Light Thinning): Removes dead, dying, and diseased trees (Class V).
Grade B (Moderate Thinning): Extends Grade A to remove suppressed trees (Class IV), defective dominant whips (Class III), suppressed stems of Class II(b), and occasional poorly formed codominants (Class I(c) and II(d)).
Conclusion: Grade B thinning is applied to classes V, IV, III, II(b), I(d), and occasional I(c). (Correct answer: Option 4)
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