The louisiana purchase was an example of the use of
a. concurrent powers.
b. implied powers.
c. judicial review.
d. individual rights.

The Louisiana Purchase was an example of the use of implied powers. 

the answer is b. Implied Powers

Implied powers is the power authorized by a document which is not directly stated, but implied within the document

The power to Acquire a new territory was not directly implied in the constitution, but Jefferson decided to buy Lousiana anyway because it does not banned it and it's within the president's capacity to do something that benefited the country.