Arrange the following ecosystems in descending order of net primary productivity in kilogram per square metre per year.

AFreshwater swamps and marshes, Midlatitude forest, Midlatitude grassland, Open ocean

BMidlatitude forest, Freshwater swamps and marshes, Midlatitude grassland, Open ocean

CMidlatitude forest, Freshwater swamps and marshes, Open ocean, Midlatitude grassland

DFreshwater swamps and marshes, Midlatitude forest, Open ocean, Midlatitude grassland

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