Explanation
When the supply of a product either increases or decreases due to an increase or decrease in its price (all the other factors remain constant), that change in the quantity of the product supplied is depicted as the movement in Supply Curve. For example, used above, if the price of the orange increases to Rs.7, we will see an increase in the quantity of the product supplied. Because we see an increase in supply, we call it Extension of the supply. This Movement in Supply Curve is an upward movement. Now, if the price is reduced to Rs.4, we will also see a decrease in the quantity of the product supplied. It is because we see a decrease in supply, we call it the contraction of the supply. This movement along the supply curve is a downward movement. Hence, correct answer is option D.
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