What is the difference between primary and secondary sources?
a. primary sources are very old, while secondary sources are created recently.
b. primary sources are firsthand accounts, while secondary sources are created after the fact.
c. primary sources are always reliable, while a secondary source's reliability depends on its creator.
d. primary sources are created by regular people, while secondary sources are the work of experts.

I think its A

Explanation:

Because a primary source is an original document or other material that has not been changed in any way. It is a reliable first-hand account usually written at or near the time the event(s) occurred. Usually it was produced by someone with direct personal knowledge of the events that are described.

c

explanation:

answer; ///i believe that the correct answer is (b)arches and domes; ///

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