Answer: 1-of, 2-1957, 3-The, 4-Soviet Union
Explanation: Thats how far i could go sorry
Noun clauses, adjective clauses, and adverb clauses are all types of dependent clauses, whereas independent clauses obviously cannot be dependent. Dependent, or subordinate clauses, cannot stand on its own, meaning that they have to be part of a bigger, complete, independent clause.
A because Peter's last name is Mar and comes before the others alphabetically
The answer you are looking for is c
Ok so here are the three sentences it leads up to.
The mission was accomplished.
A dog got in her way.
The mission was finished in 15 minutes.