Answer:
C.selling space to advertisers
Step-by-step explanation:
Selling advertising space to advertisers is one of the oldest ways that magazines have been using to generate revenue. To date, advertising still accounts for a massive percentage of revenues for magazines. Despite the emergence of other revenue streams for magazines, such as subscriptions, advertisers are still the biggest revenue source. Up to 59.5% of magazine revenue is through the sales of selling space to advertisers.