The answer is, "Just noticeable differences."
Weber's law was named after Ernst Weber, a German psychologist. The law postulates that the strength and intensity needed to identify changes in a stimulant correlates to the magnitude of the stimulant. In other words, the more severe a stimulus is, a greater change needs to be made for it to be noticed.
Answer:
b) I shall be speaking on the joys of volunteerism
Explanation:
The best way to atract volunteerism would be to explain to potential volunteers that the mere action of helping other will give them joy. I think this is the best because it promises joy for volunteers, which is something so simple and, at the same time, so attractive.
The rest of the options a, c and d are about receiving something in return for volunteering.
The constitution is, as the declaration of independence was a document to tell England that the america's were no longer under british rule. i hope this helps!