The Palace Museum in Beijing unveiled a plan on Tuesday to control the number of visitors after dealing with overwhelming crowds for years. According to Shan Jixiang, director of the museum, the draft plan sets an upper limit for daily visitors at 80,000. No specific date to kick off the new policy was announced, but Shan said it could begin as early as summer.

When will the new policy come into force?

A. Not revealed yet

B. This summer

C. This spring

（中國日報網(wǎng)英語點津 Helen 編輯）