Both A and R are true and R is the correct explanation of A

Both A and R are true and R is not the correct explanation of A

A is true but R is false

A is false but R is true

10%

25%

33.33%

50%

Zone I only

Zone I and II

Zone I, II and III

Zone I, II, III and IV

shear

vertical tensile splitting

buckling

any of the above

Both A and R are true and R is the correct explanation of A.

Both A and R are true but R is not .the correct explanation of A.

A is true but R is false.

A is false but R is true.