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First Quartile= Quartile 1, 25, 35, 45, 50, 60, 80, 90, 95, 100- median is 60, 35+45=80/2=40, (A)?

Order the data  from  highest to lowest

25  35  45   50   60   80  90   95   100

The median  is   60

The first quartile is the median of the data points  to  the  left   the median

So...this median is    [35 + 45] / 2   = 80 / 2   = 40   [ just as tertre found  !!! ]