25) C
Manx cat with a tail x Manx cat without a tail
t t
T Tt Tt
t tt tt
Manx cat without tail = 50%
Manx cat without a tail x Manx cat without a tail
T t
T TT (dead) Tt (67%)
t Tt (67%) tt (33%)
Manx cat without tail = 67%
Hence, C is the answer.