The principles one can combine to make a strong, unifying identity throughout an entire publication are: "Repetition and proximity" (Option D).
The proximity concept is essentially the act of ensuring that similar design components are grouped together. Unrelated objects should be separated.
The proximity principle states that grouping comparable design components together results in a more effective visual design. This is due to the fact that the physical placement of each item in the design generates a spatial link with other elements on the page.
Thus, it is correct to state that "The principles one can combine to make a strong, unifying identity throughout an entire publication are: "Repetition and proximity"
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