Answer: The statement that is an example of a common sense counterclaim is D. a decrease in size would require more teachers, which be too expensive.
Step-by-step explanation: A common sense counterclaim is a claim based on sound judgement that aims at rebutting a claim made by another person. In this case, option D. is a common sense counterclaim since it is based on a simple perception of the situation. In other words, unlike the other options, this counterclaim has not been built on statistics, surveys or research results. Instead, the person that makes the counterclaim has relied on logic by saying that hiring more teachers requires more money.