Final answer:
An act of preparation alone is not typically sufficient to constitute an attempted crime. It requires a 'substantial step' towards the commission of the crime, reflecting a clear intent to carry it out.
Step-by-step explanation:
False. An act of preparation is not typically sufficient to make one guilty of an attempted crime. In law, criminal attempt involves not only preparing to commit a crime but also taking a direct action towards its commission, which is a step beyond mere preparation. This action is often referred to as a 'substantial step' and must indicate a definite intent to commit the crime. Simply preparing for a crime does not usually reach the threshold of an attempt, as it lacks the immediacy and certainty of a substantial step towards the actual commission of the crime.