In this letter, Thomas Jefferson talks about the separation of church and state "Believing with you that religion is a matter which lies solely between Man & his God, that he owes account to none other for his faith or his worship, that the legitimate powers of government reach actions only, & not opinions, I contemplate with sovereign reverence that act of the whole American people which declared that their legislature should “make no law respecting an establishment of religion, or prohibiting the free exercise thereof,” thus building a wall of separation between Church & State. —President Thomas Jefferson, Letter to the Danbury Baptists, January 1, 1802

Which right, besides freedom of religion, does he refer to as a basis for separation of church and state?

a
freedom of assembly
b
freedom to petition the government
c
freedom of speech
d
freedom to exercise civil liberties