Consider that, of all the given options, the right side of the picture seems identical to the left side of the picture.
But it cannot be identical, since the letter on the right side "FIDES" cannot be seen on the right side of the picture.
Rest of all the designs seem symmetrical about the middle vertical line.
Since it is not perfectly identical, not perfectly symmetric, it can be referred as SIMILAR.
So similar patterns are evident in the given piece.
Therefore, option C is the most suitable choice.