VTMO 2014 — Grade 9 — semifinal Question 17

Which listed triple can be triangle altitudes? $A \left(1 , 2 , 3\right)$; $B \left(1 , 0.5 , 1.5\right)$; $C \left(2 , 4 , 4\right)$; $D \left(3 , 6 , 8\right)$; $E \left(3 , 6 , 9\right)$.