Basically its saying that you can look forward to more human rights
5 cubed, as in 5 to the power of 3?
Indices indicate how many times a number is multiplied by itself.
For example, 5 to the power of 2, a.k.a. 5 squared, would be 5 by 5, hence 25.
5 cubed would therefore be 5 by 5 by 5. We already know 5 by 5 (25), and now you multiply that answer by 5 again.
Your answer is 125.
I believe there are three correct answers here, and those are B, C, and E.
The topic sentence has to do with good nutrition and healthy habits which are supposed to make the world a better place in the author's personal utopia (perfect society). In order to do that, people would need to be provided with healthy and cheap food, they would need to exercise more, and have plenty of sleep in order to improve their day-to-day lives.