Final answer:
Increasing distance from the radiation source will deliver the least amount of exposure.
Step-by-step explanation:
The exposure factor that will deliver the least amount of exposure is by increasing the distance from the radiation source. According to the World Health Organization, limiting the distance from the source reduces the intensity of radiation the person is exposed to. By keeping as much distance from the source as possible, the radiation intensity drops inversely proportional to the square of the distance.