Final answer:
Marie Curie was the chemist working at the Sorbonne in the 1860s.
Step-by-step explanation:
The chemist working at the Sorbonne in the 1860s was Marie Curie, who is represented by option d) in the question.
Marie Curie was a pioneering scientist who made significant contributions to the field of chemistry. She conducted groundbreaking research on radioactivity and was the first woman to win a Nobel Prize. Curie's work laid the foundation for modern-day nuclear physics and had a profound impact on scientific understanding.