An increase in the price of hot dogs from 1.60 to 2.00 per pound increased the average number of hamburgers demanded a week from 1 to 1.4. Assuming that all other economic variables were held constant, the arc cross-price elasticity of demand between hot dogs and hamburgers is:

A) -1.5, which indicates that the two goods are substitutes

b) -1.5, which indicates that the two goods are complements

c) 1.5 which indicates the two goods are substitutes

d) 1.5, which indicates that the two goods are complements