Final answer:
Television advertising's inherent disadvantage is the fleeting nature of messages, making it challenging to ensure viewers remember the ads since they can easily skip or bypass them.
Step-by-step explanation:
The inherent disadvantage of television advertising that stands out is its fleeting nature of messages. TV commercials are transient; they appear for a brief moment and then they're gone. This ephemerality can make it difficult for advertisers to create a lasting impression unless the message is highly impactful or repeated often, which can significantly increase costs. With the modern capabilities to bypass commercials through the use of recording devices and streaming services, the audience might never even see the ads, further cementing the problem of fleeting exposure. Additionally, viewers have more choices and control over what they watch, leading to a potential decrease in the effectiveness of traditional television advertising methods. Hence, the correct answer is A. Fleeting nature of messages.