Assertion: China and India were among the world's richest countries until the eighteenth century. Reason: From the fifteenth century, China restricted overseas contact and retreated into isolation. Which of the following options is correct?
1) Both the assertion and the reason are true, and the reason is the correct explanation of the assertion.
2) Both the assertion and the reason are true, but the reason is not the correct explanation of the assertion.
3) The assertion is true, but the reason is false.
4) The assertion is false, but the reason is true.