Question

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3 how should a ball joint of an unsprung arm be checked?
by resting it on the runway and checking the play using a pry bar.
by letting the wheel hang freely and checking for play using a pry bar.
by supporting both the subframe and the ball joint, and moving the wheel side to side by hand.

Explanation:

To check a ball joint of an unsprung arm, the correct method is "By letting the wheel hang freely and checking for play using a pry bar." When the wheel hangs freely, the unsprung arm's ball joint is under the appropriate load - free condition to accurately detect play. Resting it on the runway (first option) may not simulate the correct mechanical state, and supporting both subframe and ball joint (third option) doesn't allow for proper assessment of the ball joint's play as it restricts the natural movement needed to check for looseness.

Answer:

B. By letting the wheel hang freely and checking for play using a pry bar. (assuming the options are labeled A, B, C with A being "By resting it on the runway and checking the play using a pry bar", B being "By letting the wheel hang freely and checking for play using a pry bar", C being "By supporting both the subframe and the ball joint, and moving the wheel side to side by hand")