Three statements are given followed by three conclusions numbered I, II and III. Assuming the statements to be true, even if they seem to be at variance with commonly known facts, decide which of the conclusions logically follow(s) from the statements.
Statements:
All insects are birds.
All reptiles are birds.
No crab is bird.
Conclusions:
I. No insect is reptile.
II. Some insects are reptile.
III. No crab is reptile.

Options

A. Only Conclusion I and either II or III follows.
B. Only Conclusion I and II follow.
C. Only Conclusion II and III follows.
D. Only Conclusion III and either I or II follows.

Answer

D