How does Betsabeé Romero’s Ciudades que se van (Cities on the Move) use relief techniques in an innovative way?

a. She creates an electric current that mimics the tones of aquatints.
b. She uses the linocut medium in socially conscious printmaking.
c. She carves relief patterns on tires to print designs on long sheets.
d. She employs digital printers to create unique three-dimensional prints.

c. She carves relief patterns on tires to print designs on long sheets.