Concept:The preposition "on" is used when referring to the Internet as a medium of information.
Explanation:The Internet is viewed as a platform where data and information are hosted.
Standard English usage pairs "available" with "on" when referring to the Internet.
The phrase "available on the Internet" is idiomatic and widely accepted.
"With" would mean together with the Internet, which is incorrect in this context.
"In" is used for enclosed physical spaces, so it does not fit here.
"At" refers to a specific point or location, which is not appropriate for the Internet as a whole.
Therefore, among the given options, only "on" is grammatically and idiomatically correct.
Answer:The information is available on the Internet.
Correct option: B. on