Instead of room temperature ($25^\circ\text{C}$), if the water used for soaking is $50^\circ\text{C}$, the percentage of water absorbed by raisins will be

Osmosis is a physical process of diffusion where water molecules move across a semi-permeable membrane. The rate of osmosis is directly proportional to the temperature. At a higher temperature ($50^\circ\text{C}$ compared to $25^\circ\text{C}$), the kinetic energy of the water molecules increases, which accelerates their movement across the semi-permeable membrane of the raisins. Consequently, within the same time period, the raisins will absorb more water, resulting in a higher percentage of water absorption.

• Option A is incorrect because temperature significantly influences the rate of diffusion/osmosis.
• Option B is incorrect because higher temperature increases kinetic energy, which increases absorption rather than decreasing it.
• Option D is incorrect because while absorption increases, it does not scale linearly to be 'exactly twice' just because the Celsius temperature doubled.