The correct answer is D.
An opinion is a view or judgement formed about something, not necessarily based on fact or knowledge. An opinion can be formed based on something somebody heard, read or just seen. An opinion is strictly subjective and can not be used as a reliable fact.
Mrs. Hossack is only accused of a particular type of a crime without being found guilty yet. Her guilt can not be proven and so this excerpt is only an opinion. Once she is found guilty/unguilty, the opinion can change to a proven statement.