Answer:
B) Signaling theory suggests that expensive testimonials from celebrities indicate a higher quality product.
Explanation:
In advertisement, signalling theory uses a biological approach that celebrities, which are seen as successful, wealthy, powerful, etc. transmit a sense of quality to the products that they endorse or recommend.
For example, Mr. T's breakfast cereal was very successful during the 1980s because customers identified Mr. T with being strong, healthy and powerful. Most people are usually followers, not leaders, and we like to follow our famous celebrities.