Discussion

Explanation:

“Host” in the first sentence is used to mean ‘someone who entertains or receives guests’.
In sentence 2, “host” means ‘a place where organisms / animals live’. It can also mean that there are a multitude of snakes (or there is a variety in range of snakes) in Kerala’s forests. In both these options, the word “host” has been correctly used.
In option 3, it should be ‘play host to’ in place of ‘play the host to’. The ‘the’ after the word ‘play’ makes it awkward as it is not used with the article.
In option 4, “host” means a place where an organism lives and here it has been used correctly.

Hence, the correct answer is option 3.

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