Answer
d. inelastic at some points, and elastic at others
Work Step by Step
The slope of a linear demand curve is constant, but its elasticity is not constant at all the points. At points with a low price and high quantity, the demand curve is inelastic. At points with a high price and low quantity, the demand curve is elastic. This is because, at a low price, the quantity demanded of a good tends to change very less with a change in price as the good is still considered affordable below the equilibrium point. The vice versa holds true for a price far above the equilibrium point.
