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

Which of the following definitions best describes 'plastic pollution'?

A. A pollution process during which contaminants are released into water.
B. A pollution process that results in increased levels of pollutants in an urban environment.
C. A pollution process during which plastic contaminants are released into an environmental material.
D. An environmental pollution process during which contaminants derived from agricultural activity are released into an environmental system.

Answer: A pollution process during which plastic contaminants are released into an environmental material.