Final answer:
Freeze/thaw cycles are most effective in weathering rock, as repeated freezing and thawing cause rock to fragment.
Step-by-step explanation:
The question you asked is related to the process of weathering, which is responsible for breaking down the rock of the crust into smaller particles. Among the options given, E) freeze/thaw cycles are widely recognized as the most effective in weathering rock. This process involves water seeping into cracks in the rock, then freezing, which causes it to expand and exert pressure on the rock, leading to fragmentation. Repeated freezing and thawing can cause significant disintegration of rock over time, more so than the other options listed.