Why Did the Number of French Protestants Increase in France

Why did the number of French Protestants increase in France until 1560?

A) A significant number of noble French families on the upper rungs of society had converted to Protestantism.
B) Kings Francis I and Henry II were secret Calvinists who welcomed conversions.
C) Calvinist missionaries from England and Germany used Paris as a base from which to convert French Catholics.
D) Divisions among Protestant reformers in Switzerland and Germany paradoxically unleashed a competition for converts in other European states.