The only possible new equilibrium point is at b.
The graph you sent me shows a change in supply and demand. The original supply curve is labeled "Original supply" and the new supply curve is labeled "New supply."
The price is on the y-axis and the output (in millions) is on the x-axis. The demand curve is not labeled, but it is the downward-sloping curve that intersects the original supply curve at point A.
If the demand curve shifted more to the right, the new equilibrium point would be at b. This is because a rightward shift in the demand curve would mean that there is more demand at each price level.
This would cause the price to rise and the quantity to increase until the new equilibrium point is reached at b.
The other points that you listed are not possible equilibrium points because they are either not on the new supply curve or they do not represent a point where the supply and demand curves intersect.
Here are the reasons why each of the other points is not a possible equilibrium point:
Point A: This is the original equilibrium point, but it is not possible with the new supply curve.
Point c: This point is not on the new supply curve.
Point d: This point is on the new supply curve, but it is not a point of intersection with the demand curve.
Therefore, the only possible new equilibrium point is at b.