A Research Participant Can Just Discern the Difference Between 50

A research participant can just discern the difference between 50 and 51 candles burning in an otherwise darkened room. According to Weber's law, how many lit candles would have to be added to 300 already-lit candles before a participant could just notice the difference in illumination?

A) one additional candle, for a total of 301 candles
B) three additional candles, for a total of 303 candles
C) six additional candles, for a total of 306 candles
D) ten additional candles, for a total of 310 candles

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