price (dollars per pizza)\nquantity (millions of pizzas per year)\nin the above figure, the movement from…

price (dollars per pizza)\nquantity (millions of pizzas per year)\nin the above figure, the movement from point a to point b reflects\nan increase in the price of pizza.\na decrease in income if pizza is a normal good.\nan increase in the supply of pizza.\nan increase in the number of producers of pizza.\na decrease in the cost of the tomato sauce used to produce pizza.
Answer
Brief Explanations:
The movement from point a to point b is along the supply - curve S. A movement along a supply - curve is caused by a change in the price of the good itself. When the price of pizza increases, there is an upward movement along the supply curve of pizza. Other factors like change in income (affects demand for normal goods), change in the number of producers, change in the cost of inputs (like tomato sauce) and change in supply shift the entire supply curve, not cause a movement along it.
Answer:
an increase in the price of pizza.