The correct answer is (B) — a fully saturated six-membered ring with each carbon bearing two H atoms (CH₂ groups).
Cyclohexane (C₆H₁₂) is a saturated cyclic hydrocarbon with all single bonds between carbon atoms.
Source: Chapter 4, Section 4.2.2 – Chains, Branches and Rings
Examiners expect you to recall that cyclohexane is a saturated compound, so it has no double or triple bonds. Option B is the only structure with a plain six-membered ring and all single C–C bonds (each C has two H atoms attached), matching the formula C₆H₁₂. Options A and D show double bonds (unsaturated); Option C shows triple bonds — both are incorrect for cyclohexane.