For natural numbers $$m, n$$ if $$(1 - y)^m(1 + y)^n = 1 + a_1y + a_2y^2 + \ldots$$, and $$a_1 = a_2 = 10$$ then $$(m, n)$$ is

A

(20, 45)

B

(35, 20)

C

(45, 35)

D

(35, 45)