Higher pitch of roof i) results in stronger roof ii) require more covering material iii) results in weaker roof iv) require less covering material
A(i) and (iii)
B(i) and (iv)
C(ii) and (iii)
D(ii) and (iv)
A(i) and (iii)
B(i) and (iv)
C(ii) and (iii)
D(ii) and (iv)