mrs boyle death increases suspense in the play because ?
it proves that someone else will be the victim next
it makes the audience wonder who killed her
it proves that trotter is the murderer
it brings the police to monkswell manor
Mrs. Boyle was murdered in an empty room. Because the lights were out, it is not known who killed her. It could be anyone -- so her murder makes the audience wonder who killed her, since it could be any one of the characters.