Your answer is C. Acquaint yourself with the political situation in Africa, because the first letter is capitalized and all the proper nouns are capitalized. :)
This is a complex sentence which consists of a dependent or subordinate clause and an independent clause.
'If you finish your yard work' -- dependent clause
'you can take the car to the movie' -- independent clause.
The synonyms are hard,firm, set, frozen etc,<span />
