One Big Problem with Marketers Who Rely on a Share-Of-Voice

One big problem with marketers who rely on a share-of-voice budget plan is that they assume, often wrongly, that:

A) their competition doesn't know how to allocate its advertising dollars.
B) their sales figures should automatically dictate their advertising figures.
C) they know how much competitors are really spending.
D) their ad is distinct, unique, and superior among all others in the field.