Which of the following structures has a better leaving group? Justify your answer.

Structure (b) has a better leaving group because the loss of the leaving group forms a weaker (more stable) base that is neutral.

Structure (b) has a better leaving group because the loss of the leaving group forms a stronger (more stable) base that is charged.

The leaving groups of both structures have the same leaving group ability because of the presence of the oxygen atom.

None of these.