The answer C correctly uses possessive form and is the right answer. It's not A because there is only one George so the apostrophe is in the wrong place. In B, there's not even an apostrophe and it's not clear as to whether there is only one cousin or two or more cousins. In answer D, here should not be an apostrophe for develops.
The coordinating conjunctions are: for, and, yet, so
Use care with secondary clauses. Use active voice. Use powerful verbs. Follow grammar rules
During the Alaskan Gold Rush thousands of mostly nameless<span> men sought their fortune in a harsh environment and lost</span>
