There is not a multiple choice
A concrete statement can be considered as a 'solid' statement. This means that the sentence must contain hard facts to manifest the credibility of the statement. As much as possible, you give specific examples and provide evidence for this. From the choices, the answer would be D.
c. because answer A is irrelevant because the piece of evidence is about how to count not about rocks. Answer B is also irrelevant because there is no proof that wind-wolf was forced to work instead of helping out. answer D has nothing to do with any of it because the evidence is about counting not that he is unhappy or wants to learn differently.
Answer:
Shall continue to
Explanation:
The author's claim is that students should have more recess time. That is the point he/she is trying to prove. "Without more recess time" means "if the students don't have more recess time." The answer is not 'will,' because the author is trying to prove that students are already struggling with their problems and won't get better unless they have more recess time. It is not 'might,' because that is still negative for their point that students should have more recess time to not struggle with their problems. It is 'shall continue to' because the author is proving that students are already struggling with problems and will continue to struggle without more recess time.