先通读下面短文，掌握其大意，然后从短文后面各题所给的A、B、C、D四个选项中，选出最佳选项。

Fifteen wild Asian elephants that left their home in Xishuangbanna last year are continuing to march north, according to China Daily on June 4th, 2021, which attracts much attention 1 the public. The endangered Asian elephant enjoys Class-A 2 in China, the same level as the giant panda does. The number of Asian elephants in China has 3 from 170 in the 1970s to about 300 nowadays. Why are they on the 4 ? Maybe there are two main reasons. First, the growing population of elephants need more space and food to live. Second, some areas where they live often face huge pressure to develop the local economy（经济）, making them move to other areas. 5 the government is taking action to lead them gradually back to their home.