Final answer:
The sentence 'This is sometimes the case.' in the persuasive conclusion acknowledges the counterargument, showing the acknowledgment of different viewpoints while arguing against them. Therefore the correct answer is C. acknowledge the counterargument
Step-by-step explanation:
The sentence "This is sometimes the case." in the sample persuasive conclusion serves to acknowledge the counterargument. In a persuasive essay, after articulating one's own viewpoint, it is common practice to acknowledge potential opposing views or concessions. Recognizing counterarguments can strengthen the original argument by showing that the writer has considered multiple viewpoints before reaching a conclusion. This particular sentence illustrates an understanding that there are instances where sports can positively engage students in learning, yet the writer is arguing that relying on sports as a motivator does not align with the educational values that should be prioritized.