The best position to put a person who has lost consciousness is option 3, to put them in a semi-prone position, which means half on their side and half on their front.

Option 1, to make the person lie on their back, is not the best position because it can obstruct their airway and cause difficulties with breathing. It may also increase the risk of choking or vomiting.

Option 2, to make the person lie with their face downward, is also not recommended because it can further restrict their ability to breathe. This position can potentially block the airway, leading to more severe breathing problems.

Option 4, to put the person in a reclining position, is not ideal either. While it may provide some comfort, it does not prioritize the person`s airway and can still hinder their ability to breathe properly.

Putting the person in a semi-prone position is the best choice because it helps maintain an open airway and allows any potential vomit or saliva to drain out of the mouth, reducing the risk of aspiration. It also helps to stabilize the person`s spine and body position, decreasing the likelihood of further injury.