The correct answer is B) Quakers were among the first to speak out against slavery.
The Quakers view of slavery was: Quakers were among the first to speak out against slavery.
The Quakers were also known as the Religious Society of Freinds, and from the very beginning opposed to slavery. Indeed they denounced slavery in America and also denounced the slave trade. In 1670 they started to observe what was happening in the Caribbean island Barbados, and denounce it. Later, they did the same in Pennsylvania. So yes, Quakers were among the first to speak out against slavery.