23 pairs of chromosomes can give rise to combinations
The possible number of combination in the gametes can be calculated by using the haploid number of organisms. The possible combinations are equal to 2n, where n is the haploid number. So in human beings, possible number of combination of gametes is 223 means 8,324, 608 nearly 8.6 million.
In a human cell 46 chromosomes are present in 23 pairs. They can give rise to 8.6 millions.
So, the correct option is ‘8.6 million’.