Final answer:
The correct architect for the design of UCI's social sciences complex and the Guggenheim Museum is Frank Gehry, not Frank Lloyd Wright.
Step-by-step explanation:
The social sciences complex was designed by UCI's original architect Frank Gehry, who also designed the Guggenheim Museum. Frank Lloyd Wright, another notable figure in architecture, is wrongly attributed in options A and D with projects he did not design (the Eiffel Tower and the Taj Mahal, respectively). Instead, Frank Lloyd Wright is known for his work on the Solomon R. Guggenheim Museum. Frank Gehry, recognized for his innovative and unique approach to architecture with designs such as the Walt Disney Concert Hall, is often noted for his use of form and his ability to create structures that are both sculptural and functional.