A wrench is employed to loosen a tight bolt. Rank the configurations in order of the applied torque, from minimum to maximum. In A just the wrench is employed. In B, an extender bar is employed, perpendicular to the wrench. In C the extender bar is employed parallel to the wrench. In D the force is not perpendicular to the wrench (it seems to be at around 45 degree angle). The applied force is similar in each case.
i) D, A=B, C
ii) A, B, D, C
iii) D, A, B, C
iv) A=B=C=D