In a state-level data set, there is a variable called "extended_fc" that reports whether the state's foster care system provides resources for individuals who were previously in foster care and were not adopted into a permanent home before becoming adults.

The variable is coded "1" if the state's foster care system doesprovide such resources and the variable is coded "0" if the state's foster care system does notprovide such resources.

Of the options provided below, what does the mean of "extended_fc" equal?

Select one:

a. Average number of children in each state that receive foster care resources after age 18

b. Average number of states that provide resources for individuals who were in the foster care system as children and turned 18 while still in foster care.

c. Proportion of states whose foster care systems do not provide resources for individuals who were in the foster care system as children and turned 18 while still in foster care.

d. Proportion of states whose foster care systems provide resources for individuals who were in the foster care system as children and turned 18 while still in foster care.