Had to look for the missing options and here is my answer.
The foreign crisis that is being described above is the one in Haiti. This is when President Clinton committed U.S. troops to be the leader of a multinational force in order to regain a democratically elected president. This also led to sending former president Carter to be the one who will negotiate. Hope this helps.
Explanation: according to this passage the reason of the failure of League of Nations was attitude of the USA: USA did not join which undermined prestige, reputation and effectivity of the League.