Answer:
C: decreased tourism
Explanation:
If the river is polluted it don't exactly mean that diseases increase but, one thing for sure is that tourism will decrease.
The sentences that use commas correctly is A) Volcanoes spew molten rock and, mostly exist along the Pacific Rim.
<span>Assuming that this is referring to the same list of options that was posted before with this question, <span>the correct response would be the "invasion of Brazil," since this stated that any further attempts to colonize the Americas would be seen as an act of aggression. </span></span>
