BOTH INTERNATIONAL & INLAND By day, when it is impracticable for a small vessel engaged in diving operations to display the shapes for a vessel engaged in underwater operations, which she shall display?

Correct Answer: Option B — a rigid replica of the International Code flag "A"

Rule 27(e) provides that when it is impracticable for a small vessel engaged in diving operations to exhibit the shapes required for a vessel engaged in underwater operations, she shall display a rigid replica of the International Code flag 'A'. This ensures the diving activity is clearly marked for safety.