Step 1: Clarify top-level management's functions.
- Top-level management sets organizational objectives, establishes policies, and assesses the external business landscape for sustained viability.
Step 2: Evaluate the alternatives.
Option (D) is the sole choice that corresponds to top-level management's duties, encompassing strategic choices and environmental assessment.
Conclusion: The appropriate selection is
(D) They assess the business environment and its impact on the firm's continuation.