Which of the following best describes how erosion by groundwater might create a landform?

A. Slightly acidic water dissolves Serbian rocks underground to form a cavern

B. A stream flowing through a plain gradually wears away the rock and soil to form valley

C. Waves crashing against a rocky shoreline cause parts of the cliff to break away and produce a sea cave

D. River water slows down as it approaches the ocean and deposits sediment that builds up form a delta