Final answer:
The "Pears Soap" advertisement from 1886 best represents the idea of the importance of cleanliness and purity.
Step-by-step explanation:
The "Pears Soap" advertisement from 1886 best represents the idea of the importance of cleanliness and purity. The advertisement promoted the use of soap as a means of maintaining personal hygiene and cleanliness. It emphasized the benefits of using soap for maintaining good health and preventing the spread of germs. The advertisement campaign was part of a larger movement in Europe and America during the late 18th century to promote the relationship between cleanliness and health.