Concept:A scalene triangle is defined by having all three sides of different lengths and all three angles of different measures.
Explanation:In a scalene triangle, no two sides are equal.
Therefore, it has three unequal sides.
Among the given options, “three unequal sides” is correct.
Option A (three equal sides) describes an equilateral triangle.
Option B (two equal sides) describes an isosceles triangle.
Option D (two equal angles) also describes an isosceles triangle.
Hence, only option C matches the definition of a scalene triangle.
Answer:C. three unequal sides