I think the answer is D but I'm not sure
C.
The footprints of an enormous hound
Because
A. Laura Lyon's note could have clues in it
B. Barrymores' suspicious Behaviour
D. Sir Henry's Boot is missing
What does the obviously over grown hound got to go with a dead person ? lol
O The servant, the action took place on the stage.
Answer: APEX users: D.They can make the story exciting even without a lot of action
Explanation: