Hi there!
I believe your answer would be B. 7. I say this because the focus is the same distance away from the green point as the directrix is away from the point.
Hope this helps!
- Chris
A parabola is the locus of points equidistant from the focus and directrix. This means the distance from the green point is the same to the focus as it is to the directrix. The appropriate choice is ...
... B. 7
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