The government of Thailand passes a law stating that no U.S. dollars are allowed to enter the country. Americans traveling to Thailand therefore may not bring dollars with them. All dollars have to be exchanged for the Thailand domestic currency (Thai Baht) at any border crossing, airport, or train station. Laura, a U.S. citizen, files a lawsuit against Thailand in a U.S. court challenging the legality of this law. Laura will most likely:
a. not prevail because of the act of state doctrine.
b. prevail because the law clearly violates the U.S. Constitution
c. prevail because of the doctrine of comity
d. not prevail because Laura has sovereign immunity

Act of the state doctrine states that each and every sovereign state is bounded to respect independence of other sovereign state. The courts of any sovereign state shall not sit in the judgment of the another acts of the government or any sovereign national.

Thus, Thailand's decision can not be interfered by US courts and thus Laura will be most likely to not prevail.