The head of The Department of Transportation is an entity, which is also a part of the President's cabinet in the United States of America. Therefore, the option D holds true.
A president's cabinet is a team of different departments that the United States' president decides to take under his or her control for the purpose of heading direct administration over these departments. These departments are usually indispensable parts of federal administration.
The Department of Transportation is also one such department that comes under the purview of the president's cabinet. This is because the transportation usually takes place over cross-border, and thus involves connectivity to different parts of the nation.
Hence, the option D holds true regarding the significance of the President's cabinet.
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