The architect's greatest contribution to good seismic design is in the design of which of...

Comprehensive and Detailed Explanation From Exact Extract:

Architects have the most influence on seismic performance through building form and configuration, including the plan and cross-sectional layout. A regular, symmetrical, and well-configured building reduces torsional forces and stress concentrations during seismic events.

Structural components and connections (A) are primarily the engineer's responsibility.

Interior partitions (B) affect non-structural behavior but are less critical to seismic response.

Site location and orientation (D) influence seismic forces but are often fixed or limited by client and site constraints.

Thus, architects significantly improve seismic safety through thoughtful spatial and structural configuration design.