This question consists of a sentence which is divided into four parts numbered (1) to (4). Only one part of the sentence is not acceptable in standard written English. Identify that part which contains an error.

This sentence is an example of a third conditional structure, which refers to hypothetical past events and their consequences. The correct form should be "she would not have" instead of "she will not have" because:The past perfect ("Had she been more cautious") correctly sets up the condition.The result clause should use "would have + past participle" to indicate what could have happened if the condition had been met.Corrected Sentence:"Had she been more cautious, she would not have fallen victim to such a well-planned fraud."