Final answer:
The Rococo art style is characterized by themes such as aristocratic outings, love, and playfulness, and is known for its use of pastel colors and ornate decorations. The correct option is 1.
Step-by-step explanation:
The feature of Rococo art that distinguishes it from other styles is aristocratic couples' outings. This period in art history was noted for its focus on themes of love, classical myths, youth, and playfulness. Rococo favored pastel colors, ornate decorations, and light-hearted subjects in contrast to the serious and often religious themes of previous artistic movements like the Baroque.
Options such as chiaroscuro and sfumato are associated with Renaissance and Baroque painting, respectively, and a serious biblical theme would not typically characterize Rococo art, which veered towards leisure and entertainment of the upper classes in its subject matter.