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The author says that, "Existentialist asserts man’s freedom and will not let him call himself a product of anything. But Existentialism too denies that man has a nature".
Essentially, we evaluate the past credentials or achievements to guage the tendencies or nature of an individual. As per an exitentialist, humans have absolute freedom and their experiences in certain exams cannot be used to define them.
The author also says, "For Existentialism there is only the human condition, which is what happens to man and not what he is born like.
We must never talk about human nature or human instincts.". This implies that the current state of human condition is the only thing that matters and we shouldn't look at one's historical achievements or performances to understand their nature because we do not have a nature. We only have the present human condition.
An easiest way to define the current human condition would be to use the most recent experience or something that is ongoing i.e. current form of work. Hence, among the given options, A is the most suitable