Advertising can:
a) manipulate customers into buying a product.
b) raise the cost of producing a product.
c) assure a product does not fail.
d) prevent economies of scale in manufacturing.
e) increase demand for the product.

The answer is e) increase demand for the product

Explanation:

Advertising can increase the demand for a product in the log run by continually and consistently promoting the brand and product awareness of the product in the mind of the customer/consumer.  

Moreover, effective advertising may lead up to the economies of scales over time. And economies of scale in return, influences effective and cost saving advertising.

Marketing can never "Assure" that a product will succeed! No one can!

the clients (funders) and customers (individual nonprofit staff) are great to work with. that i can be open about being a person of faith when appropriate. the variety of my tasks each day.

answer; whoever is willing and able to pay the price;