When neighborhoods or buildings become they lose their usefulness.
a. gentrified
b. redlined
c. obsolete
d. infilled?

The answer is c: obsolete

Explanation: When neighborhoods or buildings become obsolete, they lose their usefulness.

Neighborhoods  or buildings become Obsolete when they are out of date and no more useful. It means they are no longer useful for the purpose it was created or built due to the availability of better ones. It can also be said that they are old and not current.

georgians assisted in financing united states war effort during world war i through both of the following options:

they bought war bonds from the government.

and

they gave food through the creation of victory/liberty gardens.