Which of the following describes a reason historians might want to use a primary source to study an event a) it does not need to be offically cited as a source b) it will be more reliable and than a primary source c) it described that the event as it was experienced at the time d) it summarizes another historian's eatlier research on the event

The correct answer is C. It described the event as it was experienced at the time

Explanation:

A primary source is any source including documents, paintings, manuscripts, diaries or recordings that are created at the moment the event occurs. On the other hand, a secondary source is a document that is usually created to report, summarize, analyze a primary source. In comparison to secondary sources, primary sources are created when the even occurs and are closer to it, but usually more subjective. In the case of historians wanting to study an event a primary source has multiple advantages, one of this is that the document would reflect the way the event was experienced as the source is created at the same time the event occurs or short after this, and reported by someone who was part of the event, experience it or witness it in a closer way which provides a closer perspective of the event.

(d) rivers.

explanation:

civilizations developed around rivers because their waters provided places to hunt and fish. also, as the rivers flooded, the lands around them became fertile. this allowed them to support farming. this is especially true of the nile river, which flooded the same time each year.

c. mass = force / accellaration

step-by-step explanation: