Which of the following works is considered an impressionist painting by Monet?

The work considered an impressionist painting by Monet is "Water Lilies." This series of paintings presents Monet's signature style, utilizing loose brushwork and a focus on light and color to capture the essence of the natural world, particularly his water garden in Giverny. Monet's "Water Lilies" reflects the core principles of Impressionism, emphasizing the experience of a moment over detailed realism.

In contrast, "The Balcony" is a work by Édouard Manet, and while it shares some qualities with Impressionism, it is not by Monet and does not embody the same emphasis on light and color that is characteristic of Monet's work. "The Terrace at Ste. Adresse" is by Claude Monet, but it doesn't hold the same iconic status as "Water Lilies" within the Impressionist movement. Meanwhile, "Dance at Le Moulin de la Galette" is painted by Pierre-Auguste Renoir and showcases strong elements of Impressionism, including vibrant color and dappled light, but it is not a Monet painting.

Thus, "Water Lilies" stands out as the quintessential work by Monet that exemplifies the Impressionist movement.