What is the appropriate correction for sentence 10?

The appropriate correction for sentence 10 emphasizes effective punctuation to connect two independent clauses. When using "but" to join these clauses, a comma before "but" is essential as it clarifies the relationship between the two ideas being expressed.

In this case, "Latin base" and "had" likely represent two related thoughts that can stand alone as complete sentences. Using a comma before "but" indicates the transition from one idea to another while maintaining clarity for the reader. This structure enhances readability and properly denotes the contrast between the two statements.

The other options do not provide the correct combination of punctuation needed for clarity and flow. Not placing a comma can lead to confusion or misinterpretation of the relationship between ideas. Hence, the selection of a comma placement before "but" is the best choice for ensuring clear communication of the intended meaning in the sentence.