People who referred 10 friends to the Procter & Gamble website for Physique shampoo received a free, travel-sized styling spray and were entered in a sweepstakes to win a year's supply of the shampoo. The promotion generated 2 million referrals and made Physique the most successful new shampoo ever launched in the United States. To accomplish this, P&G used .

A. buzz marketingB. opt-out marketingC. customerizationD. viral marketingE. niche marketing

D. Viral marketing.

Explanation:

Viral marketing is a marketing strategy used by an organization which involves promotion of products through social media. As the name suggest, people help spread information to other users about the company's product which in turn bring increased sales. It can be used to promote newly launched product.

In this type of marketing technique, people help spread information about a company's newly launched product on social media quickly as in the case above, as a result of incentives or free gifts offered to them.

For this form of marketing technique to be effective,

-The product to be shared must be accessible by current and intending users.

-The product should be easily transfered or shared on social media like Instagram, watsup,email. Etc.

-Information about the product should be clear and concise for current and intending users. No ambiguity.

- Organizations could also get well known people in the society like celebrities to endorse their product on the company's website, Instagram handle or other social platform. This could make the product go viral.

answer; (c) communism and socialism;