What is one drawback of using secondary sources?
o
a. they offer analyses and opinions rather than presenting facts
objectively.
o
b. they are written by people who experienced an event and
therefore offer only one perspective.
o
c. they can rely too heavily on sources that corroborate the authors'
biases.
o
d. they are too academic to be useful to most researchers.

Secondary sources cannot be relied because they are written by people who experienced an event and therefore offer only one perspective.

Explanation:

Primary sources are the prepared by a researcher during her own research. Photographs, videos, newspaper reports of that time etc are examples of primary sources. Secondary sources were already used by some earlier researchers.  

Their use in previous researches increases its reliability. But secondary sources have some disadvantages as well. They can become outdated and irrelevant. Just because it was useful for a researcher who previously used it doesn’t mean it would be useful for a new researcher with a different sample.  

Thus they usually offer limited perspectives.  

the picture is not clear

explanation:

hold on ill go look