The painting depicting a dancer in an "attitude" in a rehearsal room at the old Paris Opéra is created by Edgar Degas. His unique perspective on dance scenes is well-known. Option c is the correct choice.
The painting described, featuring a dancer in an "attitude" surrounded by onlookers in a rehearsal room at the old Paris Opéra after a fire, is associated with the artist **Edgar Degas**. Degas, a French Impressionist painter, was known for his depictions of ballet dancers and scenes from the world of dance. He had a particular fascination with capturing the behind-the-scenes moments, rehearsals, and the daily lives of dancers.
While other artists of the time, such as Pierre-Auguste Renoir and Claude Monet, were also part of the Impressionist movement, it was Edgar Degas who became renowned for his unique perspective on dance scenes, showcasing the grace and intensity of the art form. Therefore, the correct answer is c. Edgar Degas.