Answer: Option C
Step-by-step explanation:
The homozygous pair produces single type of gamete and heterozygous pair produces two different types of gametes.
Here, BBTt has B trait in homozygous condition and so only B allele will be passed as gamete to the next generation.
Since, Tt is in heterozygous condition then T allele will be passed on to half gamete and t will be passed on to half of the gamete.
So, the gametes will be BT and Bt only.
Hence, the correct answer is Option C.