Answer: i am 99% sure it is A
Explanation:
<span>Mercury's distance at inferior conjunction is 0.61 AU
Looking at a table of orbits, Mercury has an orbital distance of 0.39 AU. So the inferior conjunction will be:
1 AU - 0.39 AU = 0.61 AU</span>
I think c. Is right because pollution can contaminate the entire world if we don't work together