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 markers are pens.
2. All markers are sketches.
3. All markers are chalks.
Conclusions:
I. All pens are chalks.
II. Some chalks are sketches.

​Statements:
1. All markers are pens.
2. All markers are sketches.
3. All markers are chalks.

​Conclusions:
I. All pens are chalks. (False, we only know markers are pens and chalks, but we don’t know about all pens).
II. Some chalks are sketches. (True, all markers are sketches and all markers are chalks, so that means some chalks are sketches).

So, ​Only conclusion (II) follows.

Thus, correct option is (b).