General Intelligence · Syllogism

Two statements are followed by four conclusions numbered I, II, III, and IV. Assuming the given statements to be true even if they seem to be at variance from commonly known facts, decide which of the conclusions logically follow(s) from the statements. Statements: 1. All stars are planets. 2. All planets are trees. Conclusions: I. All planets are stars. II. All stars are trees. III. All trees are planets. IV. Some trees are stars.