WHAT IS THE SMALLEST NUMBER OF PLANES THAT ARE NEEDED TO ENCLOSE...

DE THI TOAN QUOC TE KANGAROO NAM 2016 DE KHAO SAT CO DAP AN

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18. What is the smallest number of planes that are needed to enclose a bounded part in three-dimensional space?

(A) 3 (B) 4 (C) 5 (D) 6 (E) 7