is among the most visible, most expensive and most controversial of the elements and techniques of marketing communications.

The correct answer is letter "D": Advertising.

Explanation:

Advertising is a group of strategies oriented to promote products and services within society. Though, it is not just about letting others know about the existence of something it also implies informing them of the reputation that is offered. Advertising could be controversial because of the many approaches companies use to try to get to their target population, sometimes too aggressive.

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