Final answer:
Oliver Cromwell becoming King of England was not a part of England's transition to a Constitutional Monarchy. Instead, the Glorious Revolution and the Restoration Period were key developments in establishing a constitutional monarchy in England.
Step-by-step explanation:
The development that was not a part of England becoming a Constitutional Monarchy was a) Oliver Cromwell becoming King of England.
Oliver Cromwell was the leader of the military dictatorship that came after the English Civil War. However, he did not become king. Instead, the Glorious Revolution took place with King William and Queen Mary swearing to rule by the Declaration of Rights, establishing a constitutional monarchy in October 1689. The Restoration Period of the monarchy also occurred, but this was after Parliament was dissatisfied with the military dictatorship and decided to restore the monarchy.
The development that started off the transition to a Constitutional Monarchy was d) the Petition of Rights. This document, which the king later reneged on, led to a Civil War in England.