某有机物燃烧的化学方程式:X+5O2
3CO2+4H2O,有机物X的化学式是(   )            
A. C3H8                                
B. C3H6                                
C. C3H8O2                                
D. C3H6O
某有机物燃烧的化学方程式:X+5O2
3CO2+4H2O,有机物X的化学式是(   )            
A. C3H8                                
B. C3H6                                
C. C3H8O2                                
D. C3H6O
A