Answer:
yes decrease
No N/A
Yes, Increase
Explanation:
A complementary good is a good that is consumed together. If the price of the complementary good increases, the quantity demanded of the good would decrease. this would lead to a decrease in demand for product A.
an increase in the price of product A, would increase the quantity demanded. an increase in quantity demanded leads to a movement along the demand curve and not a shift of the demand curve
An effective advertising campaign would increase the visibility of the product and increase the demand for the product. an increase in demand leads to an outward shift of the demand curve.