The answer is A. The reason is that confess requires the preposition to to follow it and because of that you must use the gerund stealing) . The to in the verb "to steal" is the prefix of the infinitive, it's not a preposition.
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AnonymousWhat about confessed to all?That was not one of the choices in the original question, which was asked a long time ago. You should have started a new post for your question, as it is not directly related to the question in this thread.
She decided to confess to all?