Lonely Planet's Travel Guides, Including Volumes Like Italy, Have Been

Lonely Planet's travel guides, including volumes like Italy, have been indispensable for travelers throughout the world since they describe out-of-the-way, inexpensive restaurants and hotels. These guides provide invaluable ________ to the establishments, though they cannot pay to be included.

A) direct sales
B) publicity
C) direct marketing
D) personnel selling
E) public service announcement