According to Figure$-$Ground Principle,

A$.$ things tend to be perceived objectively regardless of an observer's past experience.

B$.$ it is important to make sure that the most important stimuli, such as the product or brand, fade into the background.

C$.$ it is important to make sure that the most important stimuli, such as the product or brand, stand out as the figure and do not fade into the background.

D$.$ marketing campaigns often consist of a series of activities that are similar in terms of the overall "look and feel".