If Frank's and Jan's Indifference Curves Intersect at the Endowment

Multiple Choice

If Frank's and Jan's indifference curves intersect at the endowment point A,then:

A) A is on the contract curve.
B) trade will make one of them better off while making the other one worse off.
C) both indifference curves would cross the contract curve before they intersected again.
D) A can be on either Frank's or Jan's contract curve but not both.