The diagram displays the structure of ethanedioic acid. In the presence of a few drops of concentrated sulfuric acid, ethanedioic acid reacts with ethanol to produce a diester. The molecular formula of this diester is $\text{C}_6\text{H}_{10}\text{O}_4$. What is the structural formula of this diester?
- ACH$_3$CH$_2$CO$_2$CO$_2$CH$_2$CH$_3$
- BCH$_3$CH$_2$OCOCO$_2$CH$_2$CH$_3$
- CCH$_3$CH$_2$O$_2$CO$_2$CCH$_2$CH$_3$
- DCH$_3$CO$_2$CH$_2$CH$_2$OCOCH$_3$