The correct answer to be filled in the blank is: C. Symmetry.
What is Symmetry?
Symmetry refers to the uniformity and correspondence of things. The term narrow vertical tells us the manner in which the figure was positioned.
The word, symmetry indicates that there was uniformity in the positioning of the figure. So, option C is right.
Learn more about symmetry here:
https://brainly.com/question/1002723
