Which of the following is NOT one of the objectives of first aid?

The correct answer is the option indicating "Guarantee recovery." This choice is not a valid objective of first aid because first aid is intended to stabilize a person's condition and address immediate medical needs, but it does not ensure a full recovery. First aid serves to prevent further complications, maintain vital functions, and minimize worsening of the injury or illness until professional medical help can be obtained.

In contrast, the other listed objectives—preventing infection, preventing further injury, and preventing loss of life—are foundational goals of first aid. The practice is designed to provide immediate care that can mitigate risks, protect the individual from additional harm, and safeguard their life until more comprehensive medical treatment can be delivered.