Final answer:
Based on the information provided about child abuse, it is true that the majority of cases involve a relative, friend, or someone close to the child.
Step-by-step explanation:
The question pertains to whether it is true or false that more than 70% of child sexual abuse cases involve a relative, friend, or someone close to the child. Considering the information provided, which states that 81.2 percent of perpetrators are parents and 6.2 percent are other relatives, it can be inferred that the majority of child abuse, including sexual abuse, likely involves someone known to the child rather than a stranger. Therefore, the answer would be (a) True.