The distraught widow sought out the help of a medium to contact his wife uses the word medium in the same way.
In this sentence, The preferred medium for most advertisers during Super Bowl is film; however, in-store point-of-sale displays are also popular. The word medium is used as a means of communication.
The word medium can be sued to mean different things.
In this question, film is a medium that is used for media and communication purposes by the advertisers.
The last option is the answer because the medium that the widow needs is for the sake of communication.
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