An equilateral triangle has________ lines of symmetry.

The line of symmetry can be defined as the axis or imaginary line that passes through the center of the shape or object and divides it into identical halves.

An equilateral triangle, which has three equal sides, has three lines of symmetry. This is because you can fold an equilateral triangle in half three times.

An equilateral triangle has 3 lines of symmetry.

Option C is the correct choice.