1. i am not writing a paragraph for you but this will help
the locomotive helped northern industries grow because it helped americans to get goods from other nations/places
i hope i did good
Letter D is the correct answer.
The Fair Housing Act is a federal law created to prevent that landlords discriminate against tenants on the basis of gender, race, religion, disability or familial status. If a property owner is not willing to rent his/her apartment building to unmarried couples, he/she must either allow them to cohabit in the buildig or sell it to someone who will. Then, he/she should invest the money somewhere else.
I would consider it a primary source in the typical situation: it's a primary source for the events that are happening at the time of writing it.
However, if we wrote a telegram now about the ancient Romans, it would be a secondary source: the most important aspect is whether it comes from people who have witnessed the event we are interested in.