Answer:
 Excess reserves = $18750
so correct option is D) $18,750 
Step-by-step explanation:
given data 
Stella deposits = $25,000
reserve ratio = 25 percent
to find out 
how much will the bank's excess reserves increase
solution
we get here first required reserves that is express as 
required reserves = deposits × reserve ratio ....................1
put here value we get 
required reserves = $25000 × 25%
required reserves = $25000 × 0.25
required reserves = $6250 
and
excess reserve will be here as 
Excess reserves = deposits - required reserves ......................2
put here value 
Excess reserves = $25000 - $6250 
 Excess reserves = $18750
so correct option is D) $18,750