Which solid, no matter at which angle you cut it, will always have a circle for a cross section?
a) icosahedron
b) cylinder
c) circle
d) sphere

Sphere because it is a 3D circle. will always have a circle if you cut it in half.

D) Sphere

The best and most correct answer among the choices provided by your question is the fourth choice or letter D.

A sphere will always have a circle for a cross section no matter at which angle you cut it.

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