Weber's Law

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I am confused about this question. Can someone explain this?

Here are my thoughts:

I know Weber's equation is delta I = kI
Looking at the change from 2 to 2/3 to 2/9, it seems that the stimulus intensity is decreasing by a factor of 1/3
This would suggest that the intensity of sensation should also be decreasing, so I was able to eliminate choice B and C

Choice D seems close to the decrease by factor of 1/3

Can someone explain stimulus intensity and...

Weber's Law