I'd go with C.
http://www.google.com/search?q=parallel+lines+converge+at+two+points+on+the+horizon&biw=1440&bih=712&source=lnms&tbm=isch&sa=X&ei=579wVMDmHoKYgwSq3YOgCA&ved=0CAYQ_AUoAQ
In linear perspective, all parallel lines converge at a(n):
A. orthogonal.
B. vanishing point.
C. horizon line.
D. picture plane.
OK, my textbook says it both A and C so I am totally confused.
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