Final answer:
The subject of this question is d. Painting en plein air. Painting en plein air refers to the practice of painting outdoors, capturing the natural environment directly. It has a more aggressive style compared to academic painting due to the limited time available to paint.
Step-by-step explanation:
The subject of this question is d. Painting en plein air.
Painting en plein air refers to the practice of painting outdoors, directly from the natural environment. This method became popular in the 19th century, allowing artists to capture the natural light, colors, and atmosphere in their artwork. Unlike studio painting, where artists have more time to work on their paintings, painting en plein air requires quick brushstrokes and an efficient use of time to capture the desired scene.
One of the reasons painting en plein air has a more aggressive style compared to academic painting is that the artists have less time to paint what they want. This can lead to bolder brushstrokes and a more immediate and spontaneous approach to painting.