Final answer:
The correct sentence displays the use of a comma to separate clauses in English.
Step-by-step explanation:
The correct punctuation is displayed in the sentence:
Even though Laura is very young, she is already a skilled chess player.
The sentence correctly uses a comma to separate the dependent clause 'Even though Laura is very young' from the main clause 'she is already a skilled chess player'.
Learn more about Punctuation in English sentences