GEOMETRY hELP please worth 99 points

Answer:
the ans is CUB
Step-by-step explanation:
line joining pts C n T on the plane of CBD
on that plane, there are 5 pts: C, B, D, T n U
any 3 of those pts will form a plane containing C n T
as the choices are:
CUB , ACE ,BED , ABE
the ans is CUB