correct me?

We can convert each of the decimals, to numbers by moving the decimal point:

So, Japan=12.718*10^7=12718*10^4=127,180,000

Brazil: 2.0*10^8=2*10^8=200,000,000 ( Most Populated)

Germany: 80.619*10^6=80619*10^3=80, 619,000

United Kingdom: 63,708,000

Nigeria: 0.00173615*10^11=173615*10^3=173, 615, 000

Bangladesh: 15, 251*10^4=152, 510, 000

So, 

Brazil

Nigeria

Japan

Bangladesh

Germany

United Kingdom

Can I ask you one more question?

4^3*4^-5=4^3+-5=4^-2, so (A), and 4^-2=1/16, and that is also (B). (H) also works two: 1/4^2=1/16. (I) also works! and, (j) too, 4^3/4^5=1/4^2=1/16.