Answer (B) is correct . As demand becomes more elastic, the curve approaches the horizontal (infinite slope).
Answer (A) is incorrect because The lower slope of the curve on the right indicates less elasticity. Answer (C) is incorrect because Unitary elasticity is found at a (usually very) small range of a single demand curve. It is not a condition revealed by comparing two demand curves. Answer (D) is incorrect because Perfect inelasticity of demand is depicted by a vertical line. There are no degrees of perfect inelasticity.
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