Option 1: (A)-(III), (B)-(IV), (C)-(I), (D)-(II) -> Correctly matches all proverbs: "apple a day" relates to health prevention, "When in Rome" to adapting to customs, "make hay" to seizing opportunities, and "greener grass" to envying others' situations.
Option 2: (A)-(II), (B)-(III), (C)-(IV), (D)-(I) -> Incorrectly pairs the apple proverb with envy and Rome proverb with health.
Option 3: (A)-(I), (B)-(II), (C)-(IV), (D)-(III) -> Mismatches the apple proverb with opportunities and Rome with envy.
Option 4: (A)-(IV), (B)-(III), (C)-(I), (D)-(II) -> Wrongly connects the apple proverb to customs and Rome to health.
Hence, Option 1: (A) - (III), (B) - (IV) (C) - (I), (D) - (II) -> The apple proverb emphasizes preventive health care, the Rome saying advises cultural adaptation, making hay encourages seizing timely opportunities, and the greener grass idiom describes the tendency to perceive others' circumstances as more favorable -> correct