The correct answer is option 2 - "2 only". This means that statement 2 is correct, but statement 1 is not. Let`s analyze each statement separately:

Statement 1: "Snakes are always at the end of a food chain." This statement is incorrect. Snakes can be found at different positions in the food chain depending on their diet and habitat. While some snakes may be predators at the top of the food chain, feeding on smaller animals, others may be lower down in the chain as prey for larger animals.

Statement 2: "Some snakes are viviparous." This statement is correct. Viviparous snakes are those that give birth to live young rather than laying eggs. Examples of viviparous snakes include boa constrictors and rattlesnakes.

In summary, option 2 is the correct answer because statement 2 is true, while statement 1 is false. It is important to understand the characteristics and behaviors of different species to make accurate statements about them.