Which of the following is true about the Mormons?

The statement that Mormons were founded in 19th century America is accurate and reflects the historical context of the Church of Jesus Christ of Latter-day Saints, commonly known as the Mormon Church. Joseph Smith, the founder, published the Book of Mormon in 1830 and established the church shortly thereafter. This movement arose during a period of religious revival in the United States, often referred to as the Second Great Awakening, but it is distinct from mainstream Protestantism.

Understanding this context helps clarify why the other options do not hold true. The notion of Mormons as primarily a Jewish sect does not align with their foundational texts, beliefs, or practices, which are rooted in Christian theology. Although there are elements of the Protestant Reformation that influenced American religious culture, the Mormons themselves were specifically established as a new religious movement rather than directly emerging from the Reformation. Additionally, Mormons do not reject organized religion; instead, they have a structured church organization, complete with a hierarchy and formal ceremonies, which is contrary to the idea of rejecting organized religion as a whole. Thus, the identification of Mormons as a distinct American religious movement in the 19th century is a critical aspect of their identity and history.