Option 3: (A) - (IV), (B) - (II), (C) - (III), (D) - (I) -> Let's match each item correctly:
(A) TP/L = Total Product ÷ Labour units = Average Product (AP), which measures output per worker → matches (IV)
(B) ΔTP/ΔL = Change in Total Product ÷ Change in Labour = Marginal Product (MP), which measures additional output from one more unit of labour → matches (II)
(C) ∑MP = Sum of all Marginal Products = Total Product (TP), since total product is the cumulative sum of marginal contributions → matches (III)
(D) MP=0 means adding more labour doesn't increase output, which occurs when Total Product reaches its maximum point (the peak of TP curve) → matches (I)
This matching represents fundamental production theory relationships where AP measures average productivity, MP measures marginal productivity, their sum gives TP, and TP is maximized when MP becomes zero. -> correct