按简单双原子分子计算，如下给出的化学键力常数，则红外光谱中波数最大者是（ ）
A、乙烷中C−H键，k=5.1×10^5达因∙ cm^-1
B、乙炔中C−H键，k=5.9×10^5达因∙ cm^-1
C、乙烷中C−C键，k=4.5×10^5达因∙ cm^-1
D、乙醛中C=O键，k=12.3×10^5达因∙ cm^-1
A、乙烷中C−H键，k=5.1×10^5达因∙ cm^-1
B、乙炔中C−H键，k=5.9×10^5达因∙ cm^-1
C、乙烷中C−C键，k=4.5×10^5达因∙ cm^-1
D、乙醛中C=O键，k=12.3×10^5达因∙ cm^-1