Which one of the following is not a correct statement

A) Gross primary production is the total amount of energy produced by auto trophic primary producers at trophic level. B) Net primary production is the amount of energy or organic matter fixed or stored at trophic level one. C) The ecosystem productivity, whether gross or net is generally measured in gram/m2 /day or year. D) Biomass refers to the wet weight of living matter per unit area per unit time in any ecosystem