Hii!!
I think that the correct answer would be C. I know that it couldn't be A because not everyone in 2nd period got 100% and the average students got below 95%. B no because they do not have the same median. D, I do not think so at all. So I would go with C I think it is relatively the best answer!!
Hope that helps!1
Since this is an equilateral traingle, as indicated with the marks on every side, you can set each equation equal to 60.
7x-3=60
7x=63
x=9