The similarity between the religious war was that both resulted in Catholic leaders agreeing to limited tolerance of Protestantism.
It was a period of civil war in 1598 between French Catholics and the Protestants called Huguenots.
Charles V's struggled to hold his empire together against the growing forces of Protestantism and the increasing Ottoman & French pressure.
Hence, the similarity between the religious war was that both resulted in Catholic leaders agreeing to limited tolerance of Protestantism.
Therefore, the Option B is correct.
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