Final answer:
To find the probability that none of the 4 people get an injection-site reaction with the current needle, we need to multiply the probabilities of each person not getting a reaction. The exact probability cannot be determined without additional information.
Step-by-step explanation:
To find the probability that none of the 4 people get an injection-site reaction with the current needle, we need to multiply the probabilities of each person not getting a reaction. Assuming that the probability of each person not getting a reaction is independent, the probability for one person not getting a reaction is 1 minus the probability of getting a reaction (let's say p). So, the probability for each person not getting a reaction is (1-p). Since there are 4 people, the overall probability is (1-p)^4.
It is important to note that the value of p is not provided in the question. Therefore, we cannot determine the exact probability without additional information. So, none of the options provided (A, B, C, D) can be considered as the correct answer.