Why Did France Join in the Thirty Years' War in 1635

Why did France join in the Thirty Years' War in 1635, more than twenty years after the war began?

A) Spain, its Catholic neighbor, needed financial and military assistance to defeat Protestant forces in northern Europe.
B) The French king Louis XIII hoped to profit from Spain's troubles in the Netherlands and from the Austrian emperor's conflicts with Protestants in his empire.
C) Louis XIII was secretly a Protestant and hoped to overthrow the Habsburg monarchy in favor of Calvinist governments.
D) The French king and his ministers hoped to quell domestic unrest by focusing attention on the war abroad.