Help! Test on progressive era in America I don’t know this question!

Read the following passage. the early mill girls were of different ages. some were not over ten years old; a few were in middle life, but the majority were between the ages of sixteen and twenty-five. the very young girls were called "doffers." they "doffed," or took off, the full bobbins from the spinning frames, and replaced them with empty ones. based on the passage, early mill girls were mostly young. were mostly middle aged. were of a variety of ages. were mostly children.

When conducting research for forming a hypothesis, which practice should historians follow?

The articles of confederation allowed congress to: make and borrow money. declare war. create a postal service. all of these choices are correct.