Answer: B) wave nature of light
I can’t open or look at the image
Hope you could understand.
If you have any query, feel free to ask.
Because for that you need to build dams and other mega construction.. which is not possible for every country as they have many economical problems asli they have to be in large number to generate power which can feed the whole globe.. which is again difficult due to over population.
The box of 15 baseballs because it has more weight.