I'm guessing you mean 'A', and the answer would be 2
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A rhombus have 2 obtuse angles
There are 3 obtuse angles in a heptagon.
One and the two others are acute angles
An octahedron is a closed 3-d shape with 8 polygonal faces. There are 257 topologically different convex octahedra. In addition there are concave octahedra. Some of these will have no obtuse angles, others will have several.
It depends on they type of arrowhead you have. If it is a arrowhead in the shape of a directional arrow, there are no obtuse angles. The most possible obtuse angles is 1.