The hippocampus is instrumental in:

A) the formation of short-term memory.
B) the retrieval of memories from long-term memory.
C) maintaining a constant level of information filtration by the sensory registers.
D) transferring information from short-term to long-term memory.

The hippocampus is well-known for its role in transferring information from short-term memory to long-term memory, making D the best choice. While the hippocampus plays a role in short-term memory formation (A) and consolidation, retrieval, and indexing of long-term memories (B), these functions are not its primary role. The sensory registers, which filter incoming sensory information, are not directly related to the hippocampus (C).