The correct option is B AaBbccDDEeFf
The formula to calculate the types of gametes produced by an organism is
2n, where n is number of heterozygous gene loci.
To produce 16 types of gametes, organism should have 4 heterozygous gene loci and in the given options,
Aa Bb cc DD Ee Ff will produce 16 different types of gametes.
AaBbccDDEeFf=(2)4=16
AaBbccDdeeFF and AaBbCcddEEFF will produce 8 different types of gametes.
AaBbCcDDEeFf will produce 32 different types of gametes.