Answer:
It offers an excellent combination of reach and frequency
Step-by-step explanation:
The question basically seeks to extract the advantage of radio advertising in contemporary time. It must be noted that there are varying forms of advertisements, with one edging the other by one feature or the other.
The feature that ultimately stands radio advertising is the ubiquitous nature of its distribution. Simply put, it offers an excellent combination of reach and frequency. The implication of this is that the messages and information being passed out from this medium commands a far reach, attention and feedback from the larger audience.
While other listed options could be relevant, it must be stated that option A is the feature that categorically set radio advertisements apart from others.