Which of the following describes an advantage primary sources have over secondary sources for a historian? A) they can reveal how individuals experiencing historical events actually reacted
B)They can summarize a huge amount of data that a historian could not sort through alone
C) they can compare and contrast conclusions other historians have made about a time period
D) they can help a historian focus on important themes rather than on a specific piece of evidence

the answer to fill in the blank in this question would be the word resource, it is defined as the money, material or people (since human resource is a very valuable good) that a company or a person has at disposition (meaning they can use the resource as they see fit), to be able to complete a task or achieve a goal.  

d will be ur answer

to mark sum 1 brainliest there has to be 2 answer at least

answer-the island had airfields that the u.s. military needed.

president thomas jefferson hoped that the embargo act of 1807 would the united states by demonstrating to britain and france their dependence on american goods, convincing them to respect american neutrality and stop impressing american seamen. instead, the act had a devastating effect on american trade.