If the larger principal stress at the point is 34 MPs, what is the value of smaller principal stress?

Question

State of stress at a point of a loaded component is given by  $\sigma _{x}=30$Mpa;. $\sigma _{y}=8$Mpa

If the larger principal stress at the point is 34 MPs, what is the value of smaller principal stress?
(a) 12 MPa                  (b) 14 MPa      (c) 16 MPa      (d) 18 MPa