The Correctly Done CANVASS Is an Invaluable Investigative Technique That

The correctly done CANVASS is an invaluable investigative technique that can provide which of the following:

A) An actual eyewitness to the crime.
B) Information about the circumstances of the crime
C) An approximate time of occurrence and/or estimate of time of death
D) Information about the deceased - identity, habits, friends, etc..
E) A motive for the crime.
F) Four of the above (a-b-c-d)
G) Three of the above ( b-c-d)
H) All of the above