The person responsible for leaving a child younger than 6 years of age alone in a running vehicle is:

• The legal guardian of that child
• The parents of that child
• The person responsible for that child at that particular time
• All of the above
  Explanation:

  "The person responsible for leaving a child younger than 6 years of age alone in a running vehicle can be the legal guardian, the parents, or the person responsible for the child at that particular time. This ensures accountability for the child's safety, regardless of who is currently in charge."