Use the observation in the first column to answer the question in the second column. \begin{tabular}{|l|} \hline \multicolumn{1}{|c|}{ observation } \\ At 21C, Substance C has \\ a vapor pressure of \\ 129. torr and Substance D \\ has a vapor pressure of \\ 119. torr. \\ The enthalpy of vaporization \\ of Substance A is bigger than \\ that of Substance B. \\ At 1 atm pressure, \\ Substance E boils at \\ 124 . C and Substance F \\ boils at 102 . C. \end{tabular}