+1 forB .
While the relative costs of concrete and steel are a predominant consideration in the design of a skyscraper, of no less importance to civil engineers isthe time needed to fabricate the structural elementsand the distance of the project site from the production sites of the raw materials.
Subject verb disagreement error
A. of no less importance to civil engineersis the time needed to fabricate the structural elements -->Incorrect
B. of no less importance to civil engineers
...
While the relative costs of concrete and steel are a predominant consideration in the design of a skyscraper, of no less importance to civil engineers isthe time needed to fabricate the structural elementsand the distance of the project site from the production sites of the raw materials.
Subject verb disagreement error
A. of no less importance to civil engineersis the time needed to fabricate the structural elements -->Incorrect
B. of no less importance to civil engineers
...
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