Answer: Structured finance CDOs

The correct answer is **A** because structured finance CDOs are specifically backed by asset-backed securities (ABS), residential mortgage-backed securities (RMBS), commercial mortgage-backed securities (CMBS), and other CDOs. - **B** is incorrect because collateralized loan obligations (CLOs) are backed by leveraged bank loans, not asset-backed securities. - **C** is incorrect because collateralized bond obligations (CBOs) are backed by corporate and emerging market bonds, not asset-backed securities.

Author: LeetQuiz Editorial Team