____ country has launched the commercial use rocket named Smart Dragon-1(SD1) with 3 satellites ?

1) Japan
2) Russia
3) China
4) United States

Explanation:
On August 17, 2019, A new rocket for commercial use named Smart Dragon-1 (SD-1) with 3 satellites, developed by the China Rocket Company affiliated to the China Academy of Launch Vehicle Technology (CALVT) was launched successfully from the Jiuquan Satellite Launch Centre in northwest China.3 satellites were developed by 3 separate Beijing-based companies.SD-1 has a total length of 19.5 metres, a diameter of 1.2 metres and a take-off weight of about 23.1 tonnes.