Answer :

A. 12

A Cuboid has twelve edges.

AB, BC, CD, DA, EF, FG, GH, HE, AE, DH, BF, CG are the 12 edges.

B. 6

A Tetrahedron has six edges.

OA, OB, OC, AB, AC, BC are the 6 edges.

C. 9

A Triangular prism has nine edges.

AB, BC, CA, DE, EF, FD, AD, BE, CF are the edges.

D. 8

A Square Pyramid has eight edges.

AB, BC, CD, DA, OA, OB, DC, OD are the edges.

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