Techniques of making silk were first invented in China around _______ years ago.

5000

The correct answer is Option 4- 5000

Out of the choices provided, the closest answer is  5000 years ago.

The process of silk production is known as sericulture. It was discovered by the Chinese 5,000 years ago.The earliest Silk discovered in China date to around 3630 BC, meaning they are from the Chinese Neolithic period. Silk was found throughout Henan Province which is widely considered the birthplace of the Chinese civilization.

Archaeological evidence suggests silk production in China began around the 4th millennium BC, which translates to roughly 5,000 years ago. The other options (7,000, 9,000, 3,000) are either too high or too low based on current findings.