Answer:
c
Explanation:
a. Related goods can be complementray goods or substituted goods. In case of complementary goods, price of related good is inversely related to quantity demanded. In case of substituted goods, price of related good is directly related to quantity demanded.
b. It can be greater than 1.
c. It is always negative as relationship between price and quantity demanded is inverse.
d. It doesn't violate the law of demand