Answer - D - Tiepolo's shunning of straight lines and frames for curved and rounded forms, was an innovation of Rococo painting style.
Key Takeaway: Tiepolo was very fond of rounded and curved forms, shunning the straight lines and frames of the past. An innovation of the Rococo painting style, this painting trend showed the limbs of figures in the painting spilling over the sides to that the viewer has a difficult time determining what is painted and what is sculpted. This innovation also led to a new eroticism and freedom of expression in Rococo paintings.