What is the difference in simplest form n^+3n+2/n^2+5n+6 - 2n/n+3

a) 1-n/n+3
b) 1/n+3
c) n+1/n+3
d) n-1/n+3

Hello :
(n²+3n+2)/(n²+5n+6) - (2n)/(n+3) = (n+1)(n+2)/ (n+2)(n+3) - (2n)/(n+3)
=(n+1)/ (n+3) - (2n)/(n+3)
=(n+1-2n)/(n+3)
= (1-n)/(n+3)( answer : A) 1-n/n+3 )