Statistics Canada Excludes from GDP the Value of Goods and Services

Statistics Canada excludes from GDP the value of goods and services exchanged "under the counter" because

A) Statistics Canada is responsible for making an ethical decision about which activities to exclude from national income measures.
B) satisfactory methods for their measurement have not been developed.
C) their production has zero opportunity cost.
D) these goods are all intermediate goods.
E) these goods do not contribute to well-being.