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Which of the following is involved in the movement of water into roots through diffusion?

Osmosis is the process involved in the movement of water into roots through diffusion. Specifically, water moves into the root cells from the soil by osmosis, which is a type of 'passive transport'.

Passive transport is the movement of molecules or ions across a cell membrane from an area of high concentration to an area of low concentration, without the use of energy. In the case of water movement into roots, the water moves from an area of high water concentration (the soil) to an area of low water concentration (the root cells), driven by the water potential gradient.