Best description of natural selection is:

Survival of the fittest

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Struggle for existence

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Change in proportion of variations within a population

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Reproductive success of the members of a population best adapted to the environment

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Solution

The correct option is C Reproductive success of the members of a population best adapted to the environment
The best description of natural selection is 'the reproductive success of the members of a population best adapted to the environment'.
Natural selection is a gradual biological process by which the traits that help in better survival of a population by adapting to its changing environment flourishes over generations. A population generally has members with some varied traits and only the best suited variant will eventually continue reproducing and the others will die out after a few generations. For instance, if in a population of red and green beetles, the green beetles adapts better in staying away from being preyed, eventually the population of green beetles will flourish over generations due to their reproductive success and population of red beetles will get abolished. It is a key mechanism of evolution.
Thus, the correct option is 'D'.

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