A: Root Cause Analysis: Looking at the given vulnerable code line and its context, the CWE-125 (Out-of-bounds Read) vulnerability exists in the code because the `pps->sps_id` variable is used to access the `hevc->sps` array without proper bounds checking. If `pps->sps_id` is negative, it can lead to an out-of-bounds read vulnerability, which is CWE-125.