Answer:
A
Explanation:
Nasty, but doable.
I = 2 amps
R = 8 ohms
V = I * R
V = 2 * 8
V = 16 volts.
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The 4 ohm resistor sees the same voltage -- 16 volts.
V = 16
R = 4ohms
I = V/R
I = 16/4
I = 4 amps.
The current seen by the unknown resistor R is
It = 4 amps + 2 amps
It = 6 amps
Answer A.
