The productivity of labour does not depend only o its own effort and efficiency, but also on I the level of technical knowledge II. the quality of other factors III. racial qualities which allow persons from certain races to have good physique and be very active . Which of the above statements is /are correct?
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A.
I only
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B.
I and II only
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C.
I and III only
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D.
II and III only
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E.
III only
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WAEC
1991