Which of these is an example of a primary source?
a. the diary of orville wright
b. the encyclopedia britannica
c. the decline and fall of the roman empire, by edward gibbon
d. cloud atlas: a novel, by david mitchell

A The diary of Orville Wright

Explanation:

In the study of history, a primary source is an artifact, document, diary or manuscript that was created at the time under study.

answer; i believe that the correct answer is (tobacco);

answer: (fluidity)is the correct answer.

explanation: because of this characteristic, success on the battlefield depends in large part on the ability to adapt to proactively change events to our advantage as well as to react quickly to constantly changing conditions