Answer:
I can cinda relate to all of them but not the last one
Explanation:
I understand what you mean it's confusing and frustrating some time's
The answer is D. Create a system of retirement and unemployment insurance.
The government selected an age which they believed most people were retired by and the Social Service Administration allows people above that age to continue earning and income.
Hope this helps!!
An experiment is a research method in which an investigator manipulates one or more factors to observe the effect on some behavior or mental process.
<h3>What is an Experiment?</h3>
An Experiment is a test or procedure or an operation that is carried out controlled conditions so as to discover a purpose or something that is unknown so as to establish an hypothesis of the known test to.
Experiment can be carried out in a laboratory in order to establish a law or even hypothesis.
It is a form of research methods.
Therefore, An experiment is a research method in which an investigator manipulates one or more factors to observe the effect on some behavior or mental process.
Learn more about Experiment from the link. below.
brainly.com/question/25303029
