Which One or More of the Following Statements Is True

Which one or more of the following statements is true?

A) A deficiency with trusts is that the interests of the beneficiaries have to be defined in advance, so there is no flexibility.
B) A trust can allow the trustees to choose who should benefit.
C) A trust can only be created if the beneficiaries can all be named at the time the trust is set up.
D) The rights of a beneficiary under a trust may be capable of being withdrawn in some circumstances.