Final answer:
The comma splice in the provided sentence is corrected by using a period to separate the two independent clauses, resulting in "My cousin got the lead role in the play. He's so excited!" Therefore correct option is B
Step-by-step explanation:
The comma splice in the sentence "My cousin got the lead role in the play, he's so excited!" can be corrected by separating the two independent clauses with a period to make them two sentences. The correct version of the sentence is: "My cousin got the lead role in the play. He's so excited!" By doing this, we avoid the comma splice error and create a clear and grammatically correct compound sentence.
To further explain, a comma splice occurs when two independent clauses (each having a subject and a verb and able to stand alone as a sentence) are joined by just a comma without a coordinating conjunction. This can be fixed in a few ways including using a period to create two sentences, using a semicolon, or by using a comma with a coordinating conjunction such as 'and', 'but', or 'so'. In the case of our example, we chose to use a period to split the sentences.