Question

select the best evidence to support the statement that the great wall was built over the course of more than a thousand years. the great wall of china was originally built to protect ancient china from invaders. the wall itself is not a single structure. instead, it is a series of walls and fortifications....throughout chinas history more than 20 states and dynasties have worked on the wall. the most famous sections are those built by the qin dynasty (221 bce–206 bce), the han dynasty (206 bce–220 ce), and the ming dynasty (1368–1644). building the great wall was a massive undertaking. many people and materials were needed to build this enormous structure. workers built the great wall without sophisticated equipment or machines. they did not have electrical power or motors. instead, people worked side-by-side to build the wall by hand. from carla mooney, great wall of china. copyright 2015 by rourke educational media

Explanation:

The key evidence must show a time span over 1000 years. The text notes over 20 states/dynasties worked on the wall, with specific dynasties spanning from 221 BCE to 1644 CE, which is far more than 1000 years.

Answer:

"Throughout China's history more than 20 states and dynasties have worked on the wall. The most famous sections are those built by the Qin dynasty (221 BCE–206 BCE), the Han dynasty (206 BCE–220 CE), and the Ming dynasty (1368–1644)."