If $$f(x) = 3x^{10} - 7x^8 + 5x^6 - 21x^3 + 3x^2 - 7$$, then $$\lim_{\alpha\to 0}\frac{f(1-\alpha) - f(1)}{\alpha^3 + 3\alpha}$$ is

A

$$-\frac{53}{3}$$

B

$$\frac{53}{3}$$

C

$$-\frac{55}{3}$$

D

$$\frac{55}{3}$$