Question 1206694


{{{drawing( 600, 600, -10, 10, -10, 10,
blue(line(1,1,8,1)),locate(.7,1,C),locate(8.3,1,E),
red(line(4.5,5,4.5,-5)),locate(4.5,5.1,O),locate(4.5,-5.1,R),
green(line(0,0,8.7,2)),locate(0.2,-0.2,S),locate(8.7,2.1,T),

 graph( 600, 600, -10, 10, -10, 10,0)) }}} 

as you can see, answer is:

D.{{{ST}}} is not perpendicular to{{{ CE}}}