Final answer:
Growth Hackers, Meetup, and Reddit are Web sites that provide access to feedback on business ideas, through community engagement, discussion forums, and networking opportunities. So, the correct answer is c) feedback on business ideas.
Step-by-step explanation:
Websites like Meetup, Reddit, and Growth Hackers offer input on company ideas.
Growth Hackers is a community focused on growth strategies and hacks; Meetup helps people organize groups to meet in person, which can be useful for networking and discussing business ideas.
Finally, Reddit offers various forums (subreddits) where entrepreneurs can seek feedback on their business concepts, ask questions, and engage with a community that may include potential customers or industry experts.
Thus, the correct answer is c) feedback on business ideas.