Stumped in biology?

Question

In guinea pigs, B=black, b=brown, S=short hair, s=long hair. A dihybrid reproduces with a dihybrid, the expected results are?

A) 9 Black Long Hair, 3 Black Short Hair, 3 Brown Long Hair, 1 Brown Short Hair

B) 9 Black Short Hair, 6 Black Long Hair, 3 Brown long hair, 1 Black Short Hair

C) 9 Black short hair, 3 Black long hair, 3 Brown short hair, 1 Brown long hair

D) 9 Brown short hair, 3 Black long hair, 3, Brown long hair, 1 Black short hair

Thank you in advance for any help out there!

Answer 1

C. 9 Black short hair; 3 Black long hair; 3 Brown short hair and 1 Brown long hair

Explanation- Let D and d represent dominant and recessive alleles of a trait respectively. Dihybrid cross produces following ratio in F-2 generation (provided both traits follow Mendelian pattern of inheritance)

D1D2 : D1d2 : d1D2 : d1d2 = 9 : 3 : 3 : 1

(Numbers in front of the letters indicate first and second trait under consideration).