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Based on the Triangle Inequality Theorem, the sum of the lengths of any two sides of a triangle must be greater than the length of the third side.
A) 8 + 8 > 20, 8 + 20 > 8, but 8 + 20 < 8. Therefore, A does not form a triangle.
B) 20 + 10 > 30, 10 + 30 > 20, and 20 + 30 > 10. Therefore, B forms a triangle.
C) 10 + 20 > 15, 20 + 15 > 10, and 10 + 15 > 20. Therefore, C forms a triangle.
D) 8 + 4 > 12, 4 + 12 > 8, and 8 + 12 > 4. Therefore, D forms a triangle.
Therefore, sides B, C, and D form a triangle.