Sarah owns a flower shop and can model the profits from selling springtime bouquets using this equation, where b is the number of springtime bouquets. P=-5b^2 + 450b - 1000

Which statement is true if Sarah needs to make a profit of at least $9,000?

A.
Sarah must sell between 0 and 40 springtime bouquets.
B.
Sarah must sell between 40 and 50 springtime bouquets.
C.
Sarah must sell more than 50 springtime bouquets.
D.
Sarah must sell more than 90 bouquets.