There is only one sentence which contains an independent and dependent clause, and that is sentence number 3 - <span>Billy Jo thinks that the sky is blue because the sun paints it each morning. Here, 'Billy Jo thinks' is the independent clause, and there are two dependent clauses - 'that the sky is blue' and 'because the sun paints it each morning.' 1 is incorrect because there are two independent clauses; 2 is incorrect because there is one independent clause; 4 is incorrect because there is also one independent clause (while dreaming is a phrase, it is not a clause).</span>
The athlete's win at the Olympics is what most likely made them so famous, meaning that it would be important to include that in their biography. I hope this helps! :)