Answer (A) is correct . When the coefficient of elasticity (percentage change in demand/change in price) is less than one, demand is inelastic. When the coefficient is zero, the demand is perfectly inelastic.
Answer (B) is incorrect because Demand is perfectly elastic when the coefficient is infinite.
Answer (C) is incorrect because Unitary inelasticity is a meaningless term.
Answer (D) is incorrect because Unitary elasticity exists when the coefficient is exactly one.
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