challenge: What was Israel's initial response to allegations of using white phosphorus munitions in Gaza during Operation Cast Lead in 2008?
  
  A. They categorically denied using white phosphorus weapons in Gaza at all.
  B. They acknowledged the reports but claimed it was a necessary measure.
  C. They admitted to using it in limited, controlled areas.
  D. They promised to investigate the claims and take action if necessary.
  Answer: 