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Help needed in Bio paper 1 Qn!

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Question number 32. Answer is C but why? explanation please. Help would be appreciated!

http://www.xtremepapers.com/papers/CIE/Cambridge IGCSE/Biology (0610)/0610_w11_qp_11.pdf
Okay so both parent were homozygous..Consider one was BB X bb..
All the offsprings were black,therefore,black is dominant and the offspring's genotype is Bb
when BbxBb
the offsprings will be in ratio 3 (BB) : 1 (bb)
These are some genetic ratios:
hetero x hetero 3:1
hetero x homo recessive 1:1
 
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