Which one of the following will make its way most easily through the tiny space

Penetration through tiny spaces is governed by the ratio γcosθ/μ (from the Lucas-Washburn equation). For water at 100°C, viscosity μ is much lower (0.282 mPa·s) than at 20°C (1.002 mPa·s), and surface tension γ is also lower (58.9 vs 72.8 mN/m) but the viscosity drop dominates, leading to a higher ratio. Soap water at 20°C reduces surface tension to ~30 mN/m but viscosity remains near 1 mPa·s, giving a lower ratio than hot water. Glycerene is highly viscous and ineffective. Therefore, water at 100°C penetrates most easily.