Three statements are given. followed by three conclusions numbered I. II and III. 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. No Boy is a Singer.
2. All Singers are Musicians.
3. All Musicians are Actors.
Conclusions:
I. All Musicians cannot be Boys.
II. All Boys are Actors.
III. No Actor is a Boy.

Correct option is C

Given:
1. No Boy is a Singer.
2. All Singers are Musicians.
3. All Musicians are Actors.
From the given statement possible Venn diagram is as follow.

Conclusion:

I. All Musicians cannot be Boys. (True, "All Musicians cannot be Boys" means that at least one Musician must not be a Boy, which is definitely true (because Singers are Musicians, and no Singer is a Boy).​
II. All Boys are Actors. (False, Since we have no information connecting all Boys to Actors, we cannot conclude that all Boys are Actors.)
III. No Actor is Boy. (False, The statements never say that all Actors must be Musicians—only that all Musicians are Actors.)​
Thus, correct option is (c).