Charter schools are independent public schools that are given greater autonomy in exchange for increased accountability. Charter school operators are freed from many of the regulations of the traditional public school bureaucracy, thereby allowing them to pursue more innovative educational ideas than non-charter public schools can pursue. At the same time, charter schools are held accountable for achieving specific educational outcomes and are closed down if those outcomes are not met.

Which of the following, if true, best supports the assertion that students attending charter schools will, on average, perform better on assessments of writing ability than students attending traditional public schools?

A. Students who attend schools that emphasize order and discipline perform worse on assessments of writing ability than students who attend schools
that do not emphasize order and discipline.
B. The majority of students who score in the 99th percentile on assessments of writing ability attend charter schools.
C. Public schools that operate outside of the traditional public school bureaucracy spend more time teaching students writing than do traditional public
schools.
D. Students who attend schools that are allowed to experiment with their writing curricula perform better on assessments of writing ability than
students who attend schools that have less flexible curricula.
E. There are far more students attending non-charter public schools than students attending charter schools.

Pls explain your pick esp B vs D