A change in the form or nature of something

In the following question, out of the four alternatives, select the alternative which is the best substitute of the phrase.

Causing a burning sensation like that of hot liquid on the skin

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Animals living in flocks

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The rejection of all religious and moral principles, in the belief that life is meaningless

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Policy of racial discrimination

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The omission of a letter or syllable. 

Select the option that can be used as a one-word substitute for the given group of words. 

A person who believes in or tries to bring about a state of lawlessness

Direction: In the following question, out of the four alternatives, choose the one which can be substituted for the given sentence.

One who is easily deceived