Final answer:
The term referring to an active danger threatening a child's safety is Imminent Danger, commonly used in legal and child welfare contexts.
Step-by-step explanation:
The term that refers to a dangerous threat being active and operating, thereby placing a child in peril, is A) Imminent Danger. Imminent Danger indicates that there is an immediate threat to the child's safety. The situation carries a high risk that the child will suffer serious harm without intervention. Terms like Present Threat, Ongoing Risk, and Immediate Peril are similar, but Imminent Danger is commonly used in legal and child welfare contexts to describe situations where the conditions that could harm a child are presently active.