The Sinus Iridum crater............. a. Predates the Imbrium Basin. b. Has been filled by maria. c. Is superimposed on the Imbrium Basin's rings. d. Has well preserved ejecta.
Sinus Iridum is a bay-like feature located on the northwest edge of Mare Imbrium (the Imbrium Basin), and it is indeed superimposed on the Imbrium Basin's rings.
