Final answer:
Pennsylvania, home to the religious group the Society of Friends, debated the moral aspects of slavery and founded the world's first antislavery society. Hence, the correct answer is option (c).
Step-by-step explanation:
The colony that had a religious group, known as the Society of Friends (Quakers), which debated the moral aspects of slavery was Pennsylvania. The Quakers led the call to condemn the slave trade and free slaves, demonstrating their commitment to the principles of equality and the belief that slavery was a sin. Pennsylvania was also unique for its friendly relations with neighboring Indians and did not establish an official church, allowing a degree of religious tolerance not found elsewhere in English America.
Influential Quakers like John Woolman and Anthony Benezet were vocal about the immorality of slavery, which laid the foundation for anti-slavery sentiment in the colony. In 1775, Pennsylvania's Quakers founded the world's first antislavery society in Philadelphia.