Which of the following is true about a linear, downward sloping demand curve? (I) Demand becomes more elastic when you move down the demand curve

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Which of the following is true about a linear, downward sloping demand curve?

(I) Demand becomes more elastic when you move down the demand curve.

(II) Demand may become more or less elastic when you move down the demand curve.

(III) Total profit must be maximized when the goods are sold at the price with unit price elasticity of demand.

(IV) Marginal revenue must be zero when the goods are sold at the price with unit price elasticity of demand.

Select one:

(a) (II) only

(b) (III) only

(c) (II) and (IV)

(d) (I) only

(e) (IV) only