The answer should be A, the age difference between participants.
<span>B is perhaps the best answer of the suggestions. A synergistic interaction is where the result of two or more medicines taken together is greater than the impact that would have happened if the medicines had been separately at the same dosage. This can potentially increase the effectiveness, although it can have negative results as well as positive. The result could also be unexpected, so C could also be a correct answer.</span>
Using heroin can slow a driver's reaction time, cause visual distortions,and impair simple motor skills.
Its C. hope this helps plz give brainliest to me
The intensity of an activity refers to the amount of energy exerted while performing an exercise.
