Final answer:
The correct sentence with proper punctuation is 'Because today’s college students have grown up downloading music and videos, they seem to think that information just exists in cyberspace without any actual author.'
Step-by-step explanation:
The sentence that includes correct punctuation with a connecting word is: Because today’s college students have grown up downloading music and videos, they seem to think that information just exists in cyberspace without any actual author. The comma after the introductory clause is essential for proper punctuation. In contrast, using a semicolon is incorrect because it is generally used to connect two independent clauses, and in this case, 'because' begins a dependent clause. Additionally, the sentence without any punctuation leads to a run-on sentence, which is also grammatically incorrect.