Plucking
a. happens when large rocks smash against a river bed
b. is the way large boulders are transported by wind
c. happens when glaciers pull rocks from earth's surface
d. is how small, light particles are transported in water

(A) Happens when glaciers pull rocks from Earth's surface.

the correct answer is c   with the systems

the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.