Final answer:
Decay theory, interference theory, and schema theory all relate to memory and cognitive processes.
Step-by-step explanation:
Theories of decay, interference, and schema all relate to memory and cognitive processes. Decay theory proposes that forgetting occurs due to the natural deterioration of memory traces over time. Interference theory suggests that forgetting is caused by the interference of other memories, either retroactively or proactively. Schema theory, on the other hand, focuses on how pre-existing knowledge and mental frameworks influence memory encoding and retrieval.