The main structural members of an airplane wing are longerons, ribs, and spars. Longerons run spanwise along the wing and support the bending loads of the wing. Ribs give the wing its shape and transmit the loads from the skin to the longerons. Spars run spanwise along the wing and support the bending loads of the wing. Therefore, option (c) I, II, and III are correct. Stringers are also structural members, but they run chordwise along the wing and support the compression loads of the wing, which is not mentioned in the given description.
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