The correct answer is A. A subliminal message
Step-by-step explanation:
Subliminal messages are a technique used in marketing and persuasion that involves presenting auditive or visual elements that are not consciously identified as these are beyond the absolute threshold (rate of stimulus that can be perceived). Despite this, subliminal messages are processed and remain in the subconscious which can influence behaviors, actions or decisions without consciousness of this.
The message "Drink Cola" is an example of a subliminal message because you cannot consciously identify it as this is beyond your absolute threshold; however, it is likely the message is stored in your subconscious and this has an influence on your decision or actions. For example, this might cause you to want to buy a Cola after.