Which one of the following is TRUE?

A) If a consumer has monotonic preferences, then the demand of the consumer must be contained in the budget line

B) If a consumer has strongly monotonic preferences, then the demand of the consumer can contain at most one point

C) If a consumer has incomplete preferences, then the consumer's demand is empty for all non-negative prices and non-negative incomes

D) A consumer with complete, transitive, continuous preferences has non-empty demand for all non-negative prices and non-negative incomes