The Boston differ from Philadelphia, because the Boston was built without use of the grid system, unlike Philadelphia.
What is grid system?
The grid system uses sequenced columns and rows to assist arrange page items. This column-based framework allows us to consistently put text, pictures, and functionalities across the design.
Every piece has a specific location that we can see right away and duplicate elsewhere. Boston differs from Philadelphia in that it was built without the use of a grid system, whereas Philadelphia was.
Therefore, option D is correct.
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