Select the correct Sobriquets — Primary Names
match:

It is easy to see from this true-color image why Ireland is called the "Emerald Island". Intense green vegetation, primarily grassland, covers most of the country except for the exposed rock on mountaintops. Ireland owes its greenness to moderate temperatures and moist air.

Bhutan is called Druk Yul - Land of Thunderbolt. Because of the violent and large thunderstorms that whip down through the valleys from the Himalayas, Bhutan is known as the Land of Thunderbolt. T

Bahrain is also known as the "Island of pearls". 

Hold land is associated with Palestine. Hence, option C is the correct answer.