The branches of Christianity that developed during the Reformation are:
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Calvinism: This was a major theological system that emerged from the Reformation, notably associated with John Calvin.
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Baptist: While Baptists as a distinct denomination took shape later, they are generally considered to have roots in the Reformation's emphasis on believer's baptism and other reformative principles.
The other options, Roman Catholic and Eastern Orthodox Christian, were already established Christian traditions prior to the Reformation and did not develop during this period.
Therefore, the correct answers are Calvinism and Baptist.