Answer:
C. To stop conflicts within those nations
Step-by-step explanation:
US involvement overseas has been a controversial issue ever since the big stick policy. In these two cases, the stated premise was to ease tensions within the nations, though this always works to varying degrees (and usually not very well).
In Bosnia, the so-named "Bosnian genocide" required UN and US intervention, or so politicians thought, to end the killing.
In Haiti, the US didn't really intervene in the 90s, they did so earlier, but it still applies. The government had just had a shift, so Wilson, idealist that he was, sent in troops to calm the storm.