If A ∶ B = 5 ∶ 6 and B ∶ C = 6 ∶ 7, then (A + B) ∶ (B + C) ∶ (C + A) is:

A

12 ∶ 13 ∶ 11

B

11 ∶ 13 ∶ 12

C

11 ∶ 12 ∶ 13

D

13 ∶ 11 ∶ 12