The country of Oman is ruled by a monarchy, therefore Oman has which type of government?

a. democracy

b. autocracy

c. oligarchy

d. republic

Since the country of Oman is ruled by a monarchy then the government would be that of a "autocracy", although it should be noted that the extend of the power of a monarchy can vary greatly. For instance there can be relatively democratic Parliamentary monarchies.

B. autocracy

because since it's monarchy : its not republic nor democracy

and not oligrachy