Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at variance with commonly known facts, decide which of the given conclusions logically follow(s) from the statements.
Statements:
(1) All pumps are motors.
(2) All pumps are machines.
(3) All engines are machines.
Conclusions:
(1): All engines are motors.
(II): Some machines are motors.

​Statements:
(1) All pumps are motors.
(2) All pumps are machines.
(3) All engines are machines.

According to the given statements, Venn diagram will be:

Let's analyze the conclusions:

Conclusion I: All engines are motors. (False, There is no direct connection between engines and motor.)
Conclusion II: Some machines are motors. (True, Since All pumps are motors and machines => So, some machines are motors is true.)
Thus, the correct  option is (b) Only conclusion (II) follows.