Option 1 is incorrect because it states that the sun rises there as soon as it sets, which is not true as the sun rises in the east and sets in the west.

Option 2 is incorrect because it states that the sun always remains in the eastern part of the sky throughout the day in Japan, which is not true as the sun moves across the sky throughout the day.

Option 3 is correct because Japan is the easternmost country in the world, which means it is one of the first places to experience sunrise. This is why Japan is known as the ‘Land of the rising sun’.

Option 4 is incorrect because it states that the sunrise in Japan is beautiful due to the reflection of the sun`s rays from the waters of the sea, which is not the reason why Japan is called the ‘Land of the rising sun’.

In conclusion, the correct answer is option 3.