A seller of pizzas observes that because of the increase in their price of inputs, their cost of production has gone up. Accordingly, the seller increases the price of pizzas but reduces the quantity supplied. Which of the following has happened?

a) The demand curve for the seller has shifted to the right.

b) The demand curve for the seller has shifted to the left

d) The supply curve for the seller has shifted to the right

c) There has been a movement (downwards) along the demand curve for the seller because of a shift of the supply curve