Topic: Fill in the Blank,

Best Answer Explained in Below-:

The phrase "Audiences are attracted by ___ advertisement and tend to buy the product blindly" suggests that certain characteristics of advertisements can significantly influence consumer behavior. The correct choice, "colourful," highlights the role of visual appeal in marketing.

Colorful advertisements are engaging and draw attention, standing out amidst a sea of more muted messages. This vibrant appeal can evoke emotions, create a sense of excitement, and make the product more memorable. Bright colors often symbolize fun, vitality, and creativity, which can enhance a consumer's perception of the product and stimulate a desire to purchase it.

In contrast, while options like "aggressive" and "vigorous" can also depict strong marketing tactics, they carry connotations of pressure rather than attraction. "Dfficient" seems to be a typographical error and does not convey a relevant meaning in this context. Thus, "colourful" is the most appropriate choice, as it directly emphasizes the visual allure and how it harnesses emotional connections to drive impulsive buying behavior.