Final answer:
The Ancient Egyptians were the first people known to use chemicals for hair removal, employing a substance known as psilothrum, as noted by ancient Greek and Roman authors.
Step-by-step explanation:
The first people known to use chemicals to remove hair were the Ancient Egyptians. Depilatory creams were used in ancient times, and one of the earliest chemical depilatories recorded is known as psilothrum, mentioned by Greek and Roman authors. Moreover, in Jewish lore, it is said that King Solomon discovered a chemical depilatory that consisted of a mixture of lime and water and orpiment, which is arsenic trisulfide. Therefore, the correct answer to which group of people were the first to use chemicals to remove hair is A) Ancient Egyptians.