Please give correct answer
Extracted text: 1An element in plane stress is subjected to stresses ox = 100 MPa, ay = 80 MPa and Txy = -30 MPa. Which of the following answers is the normal stress acting on an element oriented at a counter-clockwise angle of 30° from the x axis? Select one: a. 69.0 MPa b. 121.6 MPa c. 80.0 MPa d. 100.0 MPa