Discussion
A design's I2C bus works with one sensor and fails when a second identical sensor is added. The cause is
Answer: B
Correct answer: both sensors responding to the same fixed address
I2C selects a device by address, so two identical parts with the same fixed address both answer at once and corrupt the data and acknowledgement. The usual remedies are a part with address-select pins, a second I2C bus, or an I2C multiplexer. Bus capacitance and acknowledgement timing are real problems on longer buses but would not appear as a clean failure on adding a second identical device.
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