Use the Following to Answer the Questions Below

Use the following to answer the questions below:
For each pair of compounds, select a correct characterization from the response list. Responses may be used more than once or need not be used at all.

-Butanedioic acid, Butanoic acid

A) have the same molecular formula but are different compounds
B) both contain a carbon ring system
C) contain the same number of carbon atoms but are not constitutional isomers
D) two names for the same compound