Which statements about sci-fi are true?
A.
Sci-fi is the short form of science fiction.
B.
Liu Cixin wrote " Folding Beijing" and won a Hugo Award for best novel in the year 2016.
C.
Hao Jingfang's novel "The Three Body Problem" won a Hugo Award for best novelette in the year 2015.
D.
Sci-fi stories are usually about space travel, other planets and aliens.