The term used in the context of landslides, meaning the downslope movement of materials under the influence of gravity, is

Mass wasting is the downslope movement of rock, soil and debris under the direct pull of gravity.

Mass tracking is not a recognised geomorphic term for this process.

Mass transfer refers to the movement of chemical species between phases, not to slope failure.

Since mass wasting names it exactly, none of the above does not apply.

Landslides, rockfalls, slumps and creep are all forms of mass wasting.

Water, slope angle and loss of vegetation cover can all trigger such movement.