Which definition best describes neglect?

Neglect is characterized by a caregiver's failure to meet a child's basic needs. This includes the absence of necessary medical care, which is critical for a child's physical and emotional well-being. When a caregiver fails to provide adequate medical attention, it can lead to serious health issues and can be classified as neglect under child protection laws.

The definitions included in the other choices do not align with the concept of neglect. Involvement in sexual activities pertains to abuse rather than neglect, while physical injury refers specifically to harm inflicted on a child, and emotional manipulation is more about psychological abuse. These elements do not capture the essence of neglect, which centers on the lack of care or support a child requires for healthy development. Therefore, the option that highlights the failure to provide medical care represents neglect accurately.