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Describe the concept of Survival of the ...

Describe the concept of Survival of the fittest.

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(i) Charles Darwin gave the theory of organic evolution by natural selection. According to him organisms which are not fit to survive in unfavourable conditions, slowly perish. Organisms that adopt themselves according to various changes are viable for existence. This explains theory of natural selection or survival of fittest.
Example: Giraffe with long neck existed as they were ableto feed themselves from taller trees.
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Statement (S ) : The concept of survival of the fittest is central to natural selection. Reason (R ) : Individuals who posses advantageous characters to adapt to the environment have better potential for survival.

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Given : 1 = Natural selection , 2 = Variations and their inheritance , 3 = Survival of the fittest , 4 = struggle for existence According the Darwinism, which of the following represents the correct squence of events in the origin of new species ?