No. of 1s is represented horizontally and 0s vertically.
There are 3 states each for number of 1s. So, it is understood that states are for 0, 1 and 2 as remainders when no. of 1s is divided by 3.
Similarly, there are 2 states each for number of 0s. So, it is understood that states are for 0 and 1 as remainders when no. of 0s is divided by 2.
Hence option A is correct.