Answer:
Hand washing has external health benefits, helping prevent the spread of communicable diseases. If a program were somehow devised so that people received a small reward every time they washed their hands, we would expect the frequency of hand washing to increase.
Explanation: People who are given something (A reward of some sort) are proven to do something more, (in this case washing their hands more), or better then they would do without a source of motivation.
Answer:
D
Explanation:
China strict one child policy causes preference of boys as they can take over their father
In order to prevent this, governments and businesses from across the world need to work together to ensure sustainable development – ensuring that economic growth doesn't come at the expense of the planet. ... “The Sustainable Development Goals is something we have never seen before.
The community putting in solar powers is sustainability
