Correct Answer - Option 1 : Shyam
According to the given information:
Ram is elder than Shyam.
Ram > Shyam.
Shyam is younger than Abhijeet implies that Abhijeet is elder than Shyam.
Abhijeet > Shyam.
Abhijeet is younger than Sanjeev implies that Sanjeev is elder than Abhijeet.
Sanjeev > Abhijeet.
Sanjeev, Ram and Shyam are brothers and Ram is the eldest among them.
Ram > Sanjeev > Abhijeet > Shyam.
Now we know Abhijeet celebrates his 18th birthday today and Shyam is younger than Abhijeet.
So, Shyam is not legally an adult.
Hence, ‘Shyam’ is correct answer.