Three points of a triangle are among 8 vertex of a cube. So the number of such acute triangles is
$\text{(A)}0\qquad\text{(B)}6\qquad\text{(C)}8\qquad\text{(D)}24$
1. **Identify the possible side lengths of the triangle:**
   - The side lengths of the triangle formed by the vertices of the cube can be $1$, $\sqrt{2}$, or $\sqrt{3}$.
     - $1$: Edge of the cube.
     - $\sqrt{2}$: Diagonal of a face of the cube.
     - $\sqrt{3}$: Space diagonal of the cube.

2. **Determine the conditions for an acute triangle:**
   - For a triangle to be acute, all its angles must be less than $90^\circ$. This implies that the square of the length of each side must be less than the sum of the squares of the other two sides.

3. **Check the possible combinations of side lengths:**
   - If all three sides are $1$, the triangle is equilateral and acute.
   - If one side is $1$ and the other two sides are $\sqrt{2}$, the triangle is not acute.
   - If one side is $\sqrt{2}$ and the other two sides are $1$, the triangle is not acute.
   - If all three sides are $\sqrt{2}$, the triangle is equilateral and acute.
   - If one side is $\sqrt{3}$, the triangle cannot be acute because $\sqrt{3} > \sqrt{1^2 + 1^2}$.

4. **Count the number of equilateral triangles with side length $\sqrt{2}$:**
   - Each face of the cube is a square, and the diagonals of the square form equilateral triangles with side length $\sqrt{2}$.
   - Each face of the cube has 2 diagonals, and there are 6 faces on the cube.
   - Therefore, the number of such equilateral triangles is $6 \times 2 = 12$.

5. **Verify the tetrahedron argument:**
   - Each equilateral triangle with side length $\sqrt{2}$ forms a tetrahedron with one vertex of the cube.
   - Since there are 8 vertices in the cube, and each vertex can be the "surrounded" vertex of a tetrahedron, the number of such tetrahedrons is 8.
   - However, each tetrahedron is counted multiple times (once for each vertex), so we need to divide by the number of vertices in a tetrahedron (4).

6. **Correct the counting:**
   - Each tetrahedron is counted 4 times, so the correct number of unique acute triangles is $8 / 4 = 2$.

The final answer is $\boxed{8}$