Right option is (b) 7.53–√ Pa
To explain I would say: One important thing to keep in mind is that pressure at a point is the normal component of force per unit area, NOT total force per unit area.
So, here we will take the normal component of 30N force, i.e:
30cos(30°)=153–√.
Press = F/A = 153–√/2
= 7.53–√ Pa.