Correct option is D
The most appropriate sequence of causes of forgetting is A, B, D, C.
A (Encoding failure) occurs when information doesn't get stored in the memory properly.
B (Interference) happens when new information disrupts the retrieval of older information.
D (Decay) refers to the fading or weakening of memory over time due to lack of rehearsal or retrieval.
C (Retrieval failure) is when the information is stored but can't be accessed due to factors like lack of cues or distractions.