问题如下图：
选项：
A. a选项为什么不对呢
B. 
C. 
D. 
解释：
NO.PZ2016082405000086 originate-to-stribute mol是什么？
The securitizeprocts were so opaque thinvestors coulnot evaluate the true risks of the investment. Structureinvestment vehicles (SIVs) were useto enhanthe risk scovery process for investors anregulators. Banks helsecuritizeassets in off-balance-sheet entities, thus further masking the true risks in the system. C Structureinvestment vehicles (SIVs) were actually useto create further layers of opaqueness. These are the off-balance-sheet entities usebanks to holsecuritizeprocts in a wthma them very fficult for investors to scrutinize.请问，什么意思？
加深不透明性，那就不利于风险发现啊？
