In percent of the cases in which a child is officially considered abused or neglected, the perpetrator is the child's biological parent.

about 90 percent

Explanation:

According to statistics children that are abused by their biological parents are about 70 or 90 percent. Physically abused 71%; emotionally abused 73%; emotionally neglected 90%; educationally neglected 94% and psychically neglected 91%. It depends also on what neglected it is, emotionally, physically or educationally.

imagine me knowing the answer

i would say b. research typically uses a variety of sources