GCEEconomicsDemand and Supply2021

When the supply of a commodity is perfectly inelastic, the supply curve is

Aa horizontal straight line parallel to the quantity axis
Ba vertical straight line parallel to the price axisCORRECT
Ca positively sloped straight line through the origin
Da negatively sloped curve
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Why the answer is B, and why the others tempt you.
Perfectly inelastic supply means that the quantity supplied does not change regardless of the price level, giving a price elasticity of supply equal to zero. This is represented graphically by a vertical straight line parallel to the price axis. A horizontal supply curve represents perfectly elastic supply.
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