The correct answer is Option 1, Australia. This is because the Great Barrier Reef, the largest coral reef system in the world, is located off the coast of Queensland, Australia. It stretches over 2,300 kilometers and is the only living thing visible from space.

Option 2, Cuba, is incorrect because although it has the largest coral reef in the Caribbean, known as Jardines de la Reina, it`s not the largest in the world.

Option 3, Ghana, is also incorrect. Ghana is located in West Africa and does not have any significant coral reef systems.

Option 4, the Philippines, is home to the Coral Triangle, which has the highest marine biodiversity in the world. It is indeed significant but not the largest in the world.

Therefore, none of the other options qualify as the location for the world`s largest coral reef system.