Three statements are given followed by two conclusions numbered I and II. 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:
1. All aliens are people.
2. All people are mammals.
3. All mammals are animals.
Conclusions:
I. Some animals are mammals.
II. All people are aliens. ​​

​Statements:
1. All aliens are people.
2. All people are mammals.
3. All mammals are animals.

I. Some animals are mammals. (True, some animals are mammals as shown in figure).
II. All people are aliens. (False, the statement is All aliens are people, which does not mean the reverse).

Thus, correct option is (a).