Economists have estimated that the cross-price elasticity of demand between beer and spirits is -0

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Economists have estimated that the cross-price elasticity of demand between beer and spirits is -0.50, the income elasticity for spirits is 1.21 and the income elasticity for wine is 5.03. These elasticities mean that:

a) beer and spirits are complements, spirits and wine are luxuries.

b) beer and spirits are normal goods, spirits and wine are luxuries.

c) beer and spirits are complements, spirits are substitutes.

d) beer and spirits are substitutes, spirits and wine are luxuries.