When consumers know nothing about products, the advertising strategy they should adopt is (). A. Choose the advertising mode to consolidate and enrich the product image.

Consumers don't know anything about the product, which means that the product is still in the lead-in period, so we should adopt the lead-in advertising model. During the product introduction period, consumers are not familiar with new products, so advertising strategies should focus on rational demands and guide consumers to fully understand new products. Therefore, the correct answer is C.