Final answer:
The statement 'Not all parents agree with the four-day week' best infers the author's claim from the study, supported by evidence that while there is strong support in general, families with elementary-aged children and those receiving special education services showed less support.
Step-by-step explanation:
The Four-Day School Week study mentioned indicates mixed parental perceptions about shifting to a four-day model. Part A of the question requires identifying the correct inference made about the author's claim, and the statement 'Not all parents agree with the four-day week' best provides an inference that can be made. This is because the study found significant differences in perceptions among various demographic areas, though there was strong support overall. However, families with elementary-aged children and families with students receiving special education services were less supportive than other groups. For Part B, the details that best support Part A are 'Strong parental support for the four-day school week was identified in all demographic areas investigated' and 'families with only elementary-aged children and families with students receiving special education services were less supportive than other groups.' Both points illustrate the strong but not universal support, providing evidence for differing opinions on the four-day school week among parents.