Which is the best example of a primary source document useful in the study of history?
a) a documentary with expert analysis of the event in question.
b) a peer-reviewed article written about the event by a respected historian.
c) a professiorial analysis of key battlefield strategies of the event.
d) a journal excerpt from a person involved in the event in question.

The fourth alternative is correct (D).

History is usually narrated in a secondary way, through specialized observers of a particular context - historians.

However, although with less incidence, there are stories that are narrated by primary sources. The fact that it is a primary source means that the information comes from someone who has experienced that historical moment, that is, it is an in loco narration. In a way, it is a privileged view that is usually valued by historians.

An example of this may be a diary of someone who is involved in a war.

working boots at local festivals

due to inefficiency of management, the business plan has failed

idk what right product means but i assume it's this one since this was the last one left after i did the other three

the finance team has misjudged the requirement of business plan and chosen a wrong line of credit

operations risk is when the employees make a mistake

flash floods have damaged all machinery in the main manufacturing

natural disasters include anything ruined in the business by the weather or other disasters such as earthquakes

there have been foreign exchange rate fluctuations

economic risks is when things in the economy changes (like interest rates, currency value). the government has a large part in controlling this