I believe it is A.) an educated opinion about the natural world.
Answer:
Using the Circle of Support Diagram, what kinds of support can I access in my community?
Explanation:
If the half-life is 5 minutes, then 30 minutes is equivalent to 6 half-lives. So, after six successive half-lives, the 400 mg of the radioisotope would have a mass of 400(0.5)⁶ = 6.25 mg.
Thus, A would be the correct answer choice here.
Focus means to concentrate without distraction.