After a 68-hour flight in the Shenzhou VII spaceship, three astronauts Zhai zhigang, Liu Boming and Jing Haipeng returned to the earth _____.

1. A.
   safely and soundly
2. B.
   safe and sound
3. C.
   safely and sound
4. D.
   safe and soundless

 After a 68-hour flight in the Shenzhou VII spaceship, three astronauts Zhai zhigang, Liu Boming and Jing Haipeng returned to the earth _____.

A. safely and soundly     B. safe and sound   C. safely and sound    D. safe and soundless

After a 68-hour flight in the Shenzhou VII spaceship, three astronauts Zhai zhigang, Liu Boming and Jing Haipeng returned to the earth _____.