Constructed with the finest Italian marble, the floor of the church is its greatest attraction and is more attractive to tourists than are its ornate stained-glass windows

B. attraction, itself more attractive to tourists than are its ornate stained-glass windows

C. attraction, itself more attractive to tourists as are its ornate stained-glass windows.

D. attraction, being more attractive to tourists than its ornate stained-glass windows

E. attraction as it more is attractive to tourists than are the church's stained glass windows