Which of the following groups supported the abolition of slavery?

northern business elites
southern planter elites
wage workers
middle-class northerners

Middle-class northerners

Explanation:

The middle class of north of US begin to call for abolition.

One of the most famous event was the protest against slavery in Germantown, Pennsylvania.

The group called the Quakers also called friends or friend of church were a christians groups which had involved in abolition of slavery protest.

These events were around 17h century.

offline recommendation systems option b

because recommendation systems produce a list of two ways

1. through collaborative filtering

or

2. through content-based filtering

where's the