The following resistors (one each) are connected in a series circuit: 470 Ω, 680 Ω, 1 kΩ, and 1.2 kΩ. The voltage source is 20 V. Current through the 680 Ω resistor is approximately

A. 60 mA

B. 30 mA

C. 6 mA

D. 300 mA

Answer: Option C

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