When 50 V Is Applied to Four Series $\mu \mathrm { A }$

Multiple Choice

When 50 V is applied to four series resistors, 100 $\mu \mathrm { A }$ flows. If R₁=12 $\mathrm { k } \Omega$ , R₂=47 $\mathrm { k } \Omega$ and R₃=56 k $\Omega$ , what is the value of R₄ ?

A) 3.85 $M \Omega$
B) 3.85 $k \Omega$
C) 385 $\mathrm { k } \Omega$

D) 38.5 $\mathrm { k } \Omega$