Acetylenic hydrogen are acidic because
A. Sima electron density of C-H Bond in acetylene is nearer to carbon, which has 50% s character
B. Acetylene has only one hydrogen on each carbon
C. Acetylene contains least number of hydrogen among the possible hydrocarbons having two carbons
D. Acetylene belongs to the class of alkynes with molecular formula `C_nH_(2n-2)`
