Which of the following is NOT true concerning the Thermae Antoninianae (Baths of Caracalla)?

A) ?The mosaics and statues emphasized a new model of male perfection.
B) ?The walls and vaults of the building did not make use of concrete.
C) ?The baths were started by Septimius Severus, but completed by Caracalla.
D) ?The complex included gardens, libraries, and meeting halls in addition to bathing facilities.

B