Yes, the correct answer is D. The Internet is public and anyone can post whatever they want, so the best way to go about it to have a specific topic in mind, and search about that.
Anonymous articles are risky as you don't know who wrote them, and self-proclaimed "experts" may not actually be experts. Browsing for interesting topics is fine, but given the sheer volume of things on the Internet, it's not the best way to go about a writing topic.
