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Option 1: Python - There is no evidence provided that pythons are killed for their beautiful skin. Therefore, option 1 is incorrect.
Option 2: King Cobra - There is no evidence provided that king cobras are killed for their beautiful skin. Therefore, option 2 is incorrect.
Option 3: Russel`s Viper - The answer given in the correct option is Russel`s Viper. This snake has been declared an endangered species due to the illegal hunting and trading of its skin. The demand for its skin comes from the fashion industry, where it is used to make luxury products. The declaration of this snake as an endangered species aims to protect it from further exploitation and prevent its population from declining. Therefore, option 3 is the correct answer.
Option 4: Krait - There is no evidence provided that kraits are killed for their beautiful skin. Therefore, option 4 is incorrect.
In conclusion, the snake that has been declared an endangered species due to the killing for its beautiful skin is the Russel`s Viper.