How do the authors use English history to support the claim that many people joined the antislavery movement for moral reasons?

The authors explain the details of the bill that would limit British involvement in the trading of enslaved people.
The authors use events from English history to describe the economic impact of involuntary servitude.
The authors provide a primary-source quotation from a British abolitionist named William Wilberforce.
The authors summarize a newspaper article about ships in Bristol carrying enslaved people.