Answer:
C. A group of farmers leave their homes to search for more fertile land elsewhere.
Explanation:
They left voluntary because no one else forced them just themselves looking for better land. A and B were both forced by war. D was also forced because they were forced by the law.
For me it would probably be B.
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Trying to impress his boss, Jim worked extra long hours.
Present participle phrases begin with an -ing word. Present participle phrases act as an adjective.