Questions: The oldest firmly-dated example is a collection of year old Nassarius snail shells found in Morocco that are pierced and covered with red ochre.

The answer is B: 100,000.

Explanation for each option:

• 82,000: This option is incorrect. While there are ancient artifacts and shell beads that date back to around 82,000 years ago, the specific example of Nassarius snail shells found in Morocco is older.

• 100,000: This is the correct answer. The oldest firmly-dated example of Nassarius snail shells, which are pierced and covered with red ochre, was found in Morocco and is approximately 100,000 years old. These shells are considered some of the earliest known examples of personal ornamentation, indicating symbolic behavior by early humans.

• 75,000: This option is incorrect. Although there are other archaeological finds from around 75,000 years ago, the Nassarius snail shells in question are older.

• None of the choices: This option is incorrect because the correct answer is indeed one of the provided choices, specifically 100,000 years.