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.

Which of the following investments is least subject to prepayment risk?
Option A:Auto loan receivable–backed securities
Option B:Commercial mortgage-backed securities (CMBSs)
Option C:Non-agency residential mortgage-backed securities (RMBSs)

Answer: B