Martin luther stressed that the
bible was the only valid source of
religious truth. why was this idea a
threat to the church?

At the time, indulgences (or payments made to the church in order to cover for sins committed) were something heavily stressed by the Roman Catholic Church. Martin Luther, a Biblical scholar, realized that what the Catholic Church was stating was backed up in the Bible nowhere, which eventually lead to the conflict between him and the Church, causing the outbreak of Protestantism.

b. second continental congress

yes

explanation:

the fighting words doctrine, in united states constitutional law, is a limitation to freedom of speech as protected by the first amendment to the united states constitution. in 1942, the u.s. supreme court established the doctrine by a 9–0 decision in chaplinsky v. new hampshire.