Given a text T, and several options, according to the question posed in the text T to choose the most appropriate option from the options as the answer, please directly output the most appropriate option, do not need to output the explanation.

Collateralized mortgage obligations (CMOs) are designed to:
Option A:eliminate contraction risk in support tranches.
Option B:distribute prepayment risk to various tranches.
Option C:eliminate extension risk in planned amortization tranches.

Answer: B