Which best revises sentence 6 to create a more appropriate and respectful tone?

The sentence is: "Although many still claim that evidence about year-round school and its link to higher achievement is inconclusive, these people need to open their eyes and see that students in these schools consistently score higher on certain assessments than students who attend schools with traditional nine-month calendars."

I'm pretty sure the answer is A. "Although many still claim that evidence about year-round school and its link to higher achievement is inconclusive, studies consistently reveal that year-round students score higher on certain assessments than those students who attend schools with traditional nine-month calendars."

Explanation:

i believe the answer is d : )

i believe the correct answer is a