Do you think astronauts feel great sense loneliness when travel alone space

A. Do you think astronauts feel great sense of loneliness when traveling alone in space?

B. Do you think astronauts feel great sense of loneliness when travel alone in space?

C. Do you think astronauts feel a great sense of loneliness when travel alone in space?

D. Do you think astronauts feel a great sense of loneliness when traveling alone in space?