1. The most vulnerable section of the society are the students.
P. Revolutionary and new fledged ideas have a great appeal to them.
Q. Agitations may be non-violent methods of protest.
R. They cannot resist the charm of persuasion.
S. They are to be taught that without discipline they cannot get proper education.
6. However if these become violent, the antisocial elements get encouraged and they put all proper working out of gear.

The correct answer is option -A.

1st sentence- The most vulnerable section of the society are the students.

Connectors - from P to R

 Sentence P -Revolutionary and new fledged ideas have a great appeal to them.

Sentence R- They cannot resist the charm of persuasion.

Connectors from R to S

Sentence R - They cannot resist the charm of persuasion.

Sentence S-They are to be taught that without discipline they cannot get proper education.

Now in last sentence Q

Agitations may be non-violent methods of protest.

Overall the passage talks about students ,that they are unguarded.They should know the value of discipline.

The correct sequence -PRSQ.