In the question, below are three statements followed by f our conclusions numbered I, II, III, and IV. You have to consider the statements to be true even if it seems to be at variance from commonly known f acts. You have to decide which of the given conclusions, if any, follows from the given statements.
Statements:
1. Some Mirrors are not Glasses.
2. All Glasses are Strong.
3. Some Strong are Fragile.
Conclusions:
I. Some Mirrors may be glasses.
II. Some Glasses are Fragile.
III. All Mirrors are Strong.
IV. Some Mirrors are Fragile. ​​

​Statements:
1. Some Mirrors are not Glasses.
2. All Glasses are Strong.
3. Some Strong are Fragile.

​Conclusions:
I. Some Mirrors may be glasses. (True, some mirrors are not glasses, which leaves open the possibility that some mirrors might be glasses).
II. Some Glasses are Fragile. (False, there is no direct or indirect relation between glasses and fragile).
III. All Mirrors are Strong. (False, there is no direct or indirect relation between mirrors and strong).
IV. Some Mirrors are Fragile. (False, there is no direct or indirect relation between mirrors and fragile).

So, ​Conclusion I only

Thus, correct option is (b).