Which type of triangle will always have exactly 1-fold reflectional symmetry? right triangle obtuse triangle equilateral triangle isosceles triangle

Isosceles Triangle      

Step-by-step explanation:

Reflection symmetry exists when the figure can be folded over onto itself along a line. This line is called the line of symmetry. In a regular polygon, the number of lines of symmetry is equal to the number of sides in the polygon.Isosceles triangle is a type of triangle that will always have exactly 1-fold reflection symmetry.1-fold reflection symmetry means that one line or 1 division can divide the whole figure into two symmetrical parts.An isosceles triangle is a triangle that has two sides of equal length. Isosceles triangle has at least one line of symmetry.

Thus, the answer is Option c) Isosceles triangle.