In the slope deflection equations, the deformations are considered to be caused by________________?

In the slope deflection equations, the deformations are considered to be caused by________________?

i) bending moment
ii) shear force
iii) axial force
The correct answer is
A. only (i)
B. (i)and(ii)
C. (ii) and (iii)
D. (i), (ii) and (iii)