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 conclusion(s) logically follow(s) from the statements.
Statements:
1. All drums are balloons.
2. No rings are balloons.
3. All rings are keys.
Conclusions:
I. No drums are rings.
II. Some keys are not drums.

​Statements:
1. All drums are balloons.
2. No rings are balloons.
3. All rings are keys.

I. No drums are rings. (True, since rings and balloons are completely separate sets and drums are inside balloons, drums and rings cannot overlap).
II. Some keys are not drums. (True, some keys are not definitely drums, there is no direct relation between keys and drums).

So, ​Both conclusions I and II follows.

Thus, correct option is (b).