The correct response is:
Data retrieval speeds will diminish on hard disk drive (HDD) because the physical disk heads have more physical movement, inducing more latency.
Fragmentation causes data to be stored in non-contiguous sectors on the disk, which means the read/write heads in an HDD must move more to access scattered pieces of data, leading to increased latency and slower retrieval speeds. In contrast, SSDs do not experience the same performance degradation from fragmentation as they have no moving parts and can access data in parallel.