A man and woman had been dating for a few years.One day, the man decided to murder his father, in order to obtain the inheritance that was promised him under the father's will. The man asked the woman to assist him in the murder, and the woman agreed. The woman subsequently purchased a knife for use in the murder. However, the following day, the woman changed her mind. She called the man and told him that she would not participate in the murder. She also returned the recently purchased knife to the store. She did not call the police. The man later murdered his father and was apprehended for the crime. The man's criminal trial concluded with a finding of not guilty.

Is the woman guilty of murder as the man's accomplice?

(A) Yes, because she did not thwart the murder.

(B) Yes, because she did not effectively withdraw.

(C) No, because the man was found not guilty.

(D) No, because she effectively withdrew from participation in the crime.