Investigators can individualize blood evidence by

The answer would be : by comparing the DNA from the test using the Kastle-Meyer test.  Kastle-Mayer test is used to detect possible presence of hemoglobin in the DNA. This results could be compared to the Law enforcement's database to find out the one's who is involved in the crime scene

C. Giving up is a form of learned helplessness used as a way to avoid unpleasant outcomes to uncomfortable or painful situations.