Which of the following is true regarding supply of a commodity?

(A) Technological progress leads to a decrease in the supply of a commodity.
(B) When the price of inputs rises, the supply curve of the good shifts to the left.
(C) Technological progress shifts the supply curve of the firm to the right.
(D) Imposition of a unit tax on a firm shifts the supply curve of the goods produced by the firm to the left.

Choose the correct answer from the options given below:

(B), (C) and (D) only

The correct answer is Option (4) → (B), (C) and (D) only

(A) Technological progress leads to a decrease in the supply of a commodity. False — Technological progress increases efficiency and output, so supply increases, not decreases.

(B) When the price of inputs rises, the supply curve of the good shifts to the left. True — An increase in the price of inputs (like raw materials or labor) raises the cost of production for the firm. At any given price, the firm is less willing or able to supply the same quantity, which causes the supply curve to shift to the left (or upward).

(C) Technological progress shifts the supply curve of the firm to the right. True — IImproved technology reduces the cost of production, increasing profit margins and encouraging firms to supply more at every price. This results in a rightward shift of the supply curv.

(D) Imposition of a unit tax on a firm shifts the supply curve of the goods produced by the firm to the left. True — A per-unit tax raises production costs, reducing supply. A unit tax is an added cost for every unit produced, which increases the firm's marginal cost and average cost of production. This decrease in profitability leads to a reduction in supply at every price, causing the supply curve to shift to the left (or upward).