Which of the following quotations shows that the author has a positive opinion of influencers?
a) "As influencers have grown in number and become more and more popular, it has become clear that they are helping to boost the economy."
b) "After building up an audience of followers, influencers enter partnerships with companies or advertisers."
c) "Most businesses sell a product or service for more than it costs to make them, which is their profit. Influencers have a less clear path."
d) "A lot of brand-building happens when the business is in its start-up phase."
