Which of the Following Is True of Contract Curves

Multiple Choice

Which of the following is true of contract curves?

A) Every point on the contract curve indicates an inefficient distribution of goods among consumers.
B) At any point on the contract curve,all the consumers have equal marginal rates of substitution.
C) A movement along the contract curve indicates that,any trade that benefits one person will necessarily benefit the other.
D) At every point on the contract curve,the marginal utility derived from the consumption of a good is identical for all the consumers.