When Sigmund Freud (1930,p.67)wrote,"It is at work in every living being and is striving to bring it to ruin and to reduce life to its original condition of inanimate matter," he was referring to

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Freud was referring to the concept of the death instinct, which posits that all living beings have an innate drive towards self-destruction and the return to a state of inanimate matter. This concept is related to Freud's broader theory of psychoanalysis and his views on human nature. The other options, such as instrumental aggression or the Nazi war machine, are not directly related to Freud's concept of the death instinct.