This involves knowledge of congruency theorems of triangles.
Option C; SSS
In the Image given to us, we see that we are only shown if sides are equal but not told about the angles.
Now, we can see that FC is equal to FD due to the Double dash on both lines indicating that they are equal to each other in length.
Similarly, EC = ED due to the single dash on both lines showing us that they have equal length.
Both triangles CFE and DFE share the same third side FE.
This means that the 3 sides of triangle CFE are equal to the corresponding 3 sides of triangle DFE.
This is a proof of SSS(side-side-side) theorem that states that if all the 3 sides of a triangle are equal in length to the 3 corresponding sides of a second triangle, then the two triangles are said to be congruent.
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