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In the loop diagram, which statement best explains why the algebraic sum of voltages around a complete closed path is zero? 
AThe current must be zero everywhere in the loop
BA charge completing the loop returns to the same electric potential reference point
CEvery resistor has equal resistance
DThe source cancels only the nearest resistor
Answer & Solution
Correct answer: B. A charge completing the loop returns to the same electric potential reference point
A complete traversal of a closed loop ends at the same point where it began. Since electric potential is single-valued, the net change in potential around the full loop is zero, giving Kirchhoff's Voltage Law. This does not require zero current or equal resistances.