Explanation

– Pair 1 is correctly matched: The Adriatic Sea is bordered by Italy, Slovenia, Croatia, Bosnia and Herzegovina, Montenegro, and Albania.
– Pair 2 is incorrectly matched: The Black Sea is bordered by Turkey, Georgia, Russia, Ukraine, Romania, and Bulgaria. Croatia does not border the Black Sea; it lies on the Adriatic Sea.
– Pair 3 is correctly matched: The Caspian Sea is bordered by Russia, Azerbaijan, Iran, Turkmenistan, and Kazakhstan.
– Pair 4 is correctly matched: Morocco has a coastline along the Mediterranean Sea (as well as the Atlantic Ocean).
– Pair 5 is incorrectly matched: The Red Sea is bordered by Egypt, Sudan, Eritrea, Djibouti, Saudi Arabia, and Yemen. Syria does not border the Red Sea; its coastline lies on the Mediterranean Sea.

Therefore, pairs 1, 3, and 4 are correctly matched — Option B.