Answer:
Unity.
Step-by-step explanation:
Graphic design can be defined as an art which typically involves the combination of texts, images and colors to communicate an idea.
In graphic design, unity refers to the harmonious relationship between the various elements in a graphical piece of art, thus, making it appear as a single beautiful piece. Therefore, unity ensure a piece of work does not appear to the viewer as separate pieces but rather presents it as a single piece.
In this scenario, you are critiquing a logo design that one of your coworkers proposed. Your sense is that the individual elements of the design are fine, but when they are combined, they just don’t work well together. Thus, the main problem with this logo is unity.