碳的某种氧化物中,碳与氧的质量比为3:8,则该氧化物中碳的化合价是请选择ABCD(A8{:T(r;g-j-Q*N,\+}2C5X9M)V,u,A,N;p:O-r2X
A.+2价9M)V,u,A,N;p:O-r2X
B.+4价9M)V,u,A,N;p:O-r2X
C.-2价9M)V,u,A,N;p:O-r2X
D.0价9M)V,u,A,N;p:O-r2X