Final answer:
In a 220 volt, three-phase, 4-wire electric service, any line will read 220 volts, which is the voltage between the line and neutral or between any two lines.
Step-by-step explanation:
On a 220 volt, three-phase, 4-wire electric service, any given line will read 220 volts when measured between the line and neutral or between any two lines. The voltage in three-phase systems is consistent across all phases, with each line providing the same voltage relative to the neutral wire. If the voltage was measured between two lines (line-to-line voltage), it would be higher due to the phase difference, but since we are considering the voltage of a single line with reference to the neutral, the answer is 220 volts. Therefore, the correct answer is A) 220 volts. This is in accordance with typical electrical distribution systems where transformers step down the high voltage from power lines for residential and commercial use to lower, usable levels, such as 220 volts in Europe or 120 volts in North America.