please help with this

Suppose a perfectly competitive firm's total cost of production (TC) is TC(q) =q" -10q~ + 30q +5, and the firm's marginal cost of production (MC) is MC(q) =3q -20q + 30. The firm's short-run supply curve is given by O A. p=q2 - 10q + 30 for prices above $2.5. O B. p=3q- -20q + 30 for prices above $15. OC p=Q2 - 10q + 30 + O D. p=3q2 - 20q + 30 for prices above $5. OE. P=q 2 - 10q + 30 for prices above $5