19.    "Advertising agencies"

    a)     do little more than sell media time or space to advertisers.
    This used to be the main business of agencies when they started, but modern agencies do much more.

    b)    are specialists in planning and handling mass selling details.
    This is the most common definition, although in some cases, agencies go even further and give advice on the entire marketing mix.

    c)    compete against the national media for the business of big advertisers.
    We could hardly call this competition, since agencies are crucial partners for the media, because they are large buyers of media space. In fact, they will buy media space even before they have the specific clients (i.e. advertisers) for that space. They buy in bulk, which allows them to get a decent price from the media and at the same time, media are assured that their media space will be used. So no, this is not the correct answer.

    d)    usually require advertisers to sign long-term contracts.
    They would certainly like that, but it is not a requirement.

    e)    prefer to work with local advertisers rather than national advertisers.
    I don't think they have any preference, but if any, I would say that national advertisers would be preferred. National advertisers are usually bigger accounts, so they allow for larger revenues, but agencies usually take whatever account they can get. It is a very competitive business.