Statement: All windows are doors. All buildings are doors. All doors are boats. Conclusions: I. All windows are boats. II. All buildings are boats. III. Some boats are doors.

Only I and II follow
Only I and III follow
Only II and III follow
All follow

Correct Answer: All follow

Explanation:

All windows are doors + All doors are boats = A + A = A = All windows are boats. Hence I follows. All buildings are doors + All doors are boats = A + A = A = All buildings are boats. Hence II follows. All doors are boats (A) → conversion → Some boats are doors(I). Hence III follows.

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