Answer:
Option A
Platinum short - AaB- Â - 6
Platinum long - Aabb  - 2
Silver short - aaB- Â - 3
Silver long - aabb - 1
Explanation:
Aa is platinum hair, aa is silver hair.
A second gene pair B and b determines hair length where short hair is dominant to long hair.
P1  AaBB     x     aabb
  AB  aB     x     ab
F1  AaBb  and  aaBb  (platinum and silver foxes)
   AaBb   x    AaBb
Platinum short - AaB- Â - 6
Platinum long - Aabb  - 2
Silver short - aaB- Â - 3
Silver long - aabb - 1