A 500 $k \Omega$ Potentiometer Is Connected Across a 5 V Source

Multiple Choice

A 500 $k \Omega$ potentiometer is connected across a 5 V source. If the voltage from the wiper to the lower end of the potentiometer is 1.2 V , what is the resistance of that lower part?

A) 120 $\mathrm { k } \Omega$
B) 380 $\mathrm { k } \Omega$
C) 0 $\Omega$
D) 500 $\mathrm { k } \Omega$