```IN EACH OF THE QUESTIONS 11 TO 15, SELECT THE OPTION THAT BEST DESCRIBES THE INFORMATION CONVEYED IN THE SENTENCE ```
The investigators stated clearly that they had reached a dead end in their scrutiny of suspects in the murder case.

• A. the investigators did not know what to do with suspects murder.
  
• B. the investigators had evidence to sentence the suspects to death in the end.
• C. there was no further progress in the investigation of the murder suspects.
  
• D. the end had come for the suspects in the murder case.