Directions: The sentence below is underlined or has an underlined part. The underlined part may have an error of grammar or syntax. There are five options that seek to correct the error (including an option that simply repeats the sentence). Select the option that best replaces the underlined part.

The criminals fled while the police reached the spot of crime.

 The original sentence bears the error of faulty use of tense and conjunction. When two past actions are in sequence, past perfect tense should be used to refer to the earlier action. Therefore, the correct usage is 'had fled'. The conjunction 'while' needs to be replaced by the conjunction 'before' to emphasize that the criminals had fled before the police arrived at the scene. This option rectifies both the errors of tense and of incorrect word usage.