Task: Class Definition Understanding (ontology: Earth_Environment/EnvironmentOntology)

Which of the following definitions best describes 'barrier island'?

A. An island formed by the accumulation of sand deposited by sea currents on a continental shelves
B. A lake which has concentrations of environmental contaminants high enough to harm the ecosystems associated with it.
C. An aquaduct to transport water from one river basin to another one, to solve problems of hydrographic imbalance. It can decrease floods, moving the water to lands with droughts.
D. A high-elevation mountain which has a maximum elevation greater than 4500 metres above sea level.

Answer: An island formed by the accumulation of sand deposited by sea currents on a continental shelves