Which famous writer was known as Chopin's lover and used a male pseudonym?

The correct answer is C. George Sand, a prominent French novelist and socialist, is famously known for her relationship with the composer Frédéric Chopin. Sand used a male pseudonym in her literary career, which was a common practice for women at the time as it allowed them to gain more visibility and credibility in a predominantly male literary world. Her choice of the name "George" was a way to navigate the gender biases of her era.

Sand's relationship with Chopin had a significant influence on both her and Chopin's artistic output. Their passionate yet tumultuous romance is well documented and highlights the intersection between their personal lives and their creative works. The partnership helped to shape their legacies, with Sand providing emotional support as well as inspiration for Chopin's compositions.

The other figures mentioned did not have similar connections to Chopin. George Eliot was the pen name of the English novelist Mary Ann Evans but had no known relationship with Chopin. Mary Shelley is famous for "Frankenstein," and Virginia Woolf was a key figure in modernist literature—they were also not associated with Chopin in a romantic context. Thus, George Sand stands out as the correct choice in this context.