Answer: B. consumers face choices and tradeoffs.
Explanation: A consumption bundle is given as a combination or a set of goods that a consumer may choose to consume. Consumers are often faced with the decision to make choices and tradeoffs (where an advantage offered by a good necessitates the corresponding loss of another good) between products due to income constraints, regulation or preferences. Consumers therefore allocate their budgets among bundles because they face choices and tradeoffs.