The correct answer is option 1: 1, 2, and 3.

To understand why, let`s dissect each option:

Option 1: 1, 2, and 3 - This option states that Hamburg, Washington, and Berlin are coastal cities. Hamburg is a coastal city in Germany, located on the Elbe River. Washington, D.C., the capital of the United States, is not directly on the coast, but it is located on the Potomac River near the Chesapeake Bay, which connects to the Atlantic Ocean. Berlin, the capital of Germany, is not directly on the coast, but it is located on the Spree River, which ultimately connects to the Baltic Sea.

Option 2: 2, 3, and 4 - This option states that Washington, Berlin, and Cairo are coastal cities. Cairo, the capital of Egypt, is not a coastal city. It is located on the banks of the Nile River, but it is not directly on the coast.

Option 3: 1 and 4 - This option states that Hamburg and Cairo are coastal cities. Hamburg is indeed a coastal city, but Cairo is not, as explained above.

Option 4: 1 only - This option states that