you have tricked us with amazing ease
However, we need to know what Solid 2 is, for it could be the same tetrahedron of different type.
I insist on C.
I vote with Mistdew.
A tetrahedron, by its very name, means 4-sides. Any other polyhedron with 4 side is in fact also a tetrahedron. Hence, since the statement states that they are different, any different solid must have more since the tetradron has the least number of sides of any type of polyhedron.
The nitpicking here is what consitutes a different type?
Former Senior Instructor, Manhattan GMAT and VeritasPrep
Vice President, Midtown NYC Investment Bank, Structured Finance IT
MFE, Haas School of Business, UC Berkeley, Class of 2005
MBA, Anderson School of Management, UCLA, Class of 1993