ACCORDING TO THE PASSAGE, WHY DIDN’T BUSINESSES USE CROWDSOURCING IN...
29: According to the passage, why didn’t businesses use crowdsourcing in the past?
A. It was too hard to collect and check lots of people’s ideas.
B. People weren’t as smart as they are today.
C. It was usually illegal in most countries to do this.
D. No one had ever thought of the idea of crowdsourcing before.