ANS:B - 10^-1 cm²/sec

The binary diffusivity in gases at atmospheric conditions typically falls within the range of 10−510−5 to 10−610−6 m²/s. Given the options provided, 10−110−1 cm²/s would be the closest, although it's significantly larger than typical values for binary diffusivity in gases at atmospheric conditions. The correct answer would be more aligned with the order of magnitude around 10−510−5 to 10−610−6 m²/s. None of the options exactly match, but 10−110−1 cm²/s is the closest.