Three CSF Tubes Are Received in the Laboratory Numbered 1

Three CSF tubes are received in the laboratory numbered 1 through 3 based on the order in which they were obtained,with 1 being the first.The first tube is cloudy pink,but this color diminishes and clearing occurs with each successive tube.What does this suggest?

A) Internal bleeding into the CSF has occurred.
B) This is blood contaminating the CSF fluid from a traumatic puncture.
C) Bacterial infection is likely present.
D) Metastatic tumor is likely present.