The correct answer is: D. A reduction in the price of resources in producing Y
An increase in the quantity supplied of a good is a movement along the supply curve, while an increase in the supply of a good is a shift of the supply curve.
A reduction in the price of resources in producing Y will cause a decrease in the cost of production, which will lead producers to produce more of Y at each price. This is a movement along the supply curve, not a shift of the supply curve.
An increase in the price of Y will cause a movement along the demand curve for Y, not a shift of the demand curve.
An increase in the price of Y, a complement in the production of Y, will cause a decrease in the demand for Y, which will lead producers to produce less of Y at each price. This is a movement along the supply curve, not a shift of the supply curve.
An improvement in the technology producing Y will cause a shift of the supply curve to the right, as producers will be able to produce more of Y at each price.
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