The correct answer is D) None of these. Light vehicles aboard Ro-Ro (roll-on/roll-off) vessels are typically secured using vehicle restraints, such as lashing straps or tie-down chains, rather than chain levers, turnbuckles, or wire. Vehicle restraints are specifically designed to securely hold vehicles in place during transport, in accordance with the regulations and best practices for Ro-Ro vessel operations. The other options, such as chain or wire, would not provide the necessary stability and safety required for securing light vehicles on these types of vessels.