Psychology help?

John is weightlifting at the gym. He works out with 100 pounds and then adds 5 pounds, but notices no increase in weight. He instead adds 10 pounds and notices the increase in weight. He notices that if he increases the weight by 10 percent each time he feels the increase in weight. This best illustrates:

A. absolute thresholds.
B. Weber's law.
C. top-down processing.
D sensory adaptation.

i think it is D. because his body was conditioned to a particular weight before he had to go so he had to add more to see a change. his body was adapted ( eventually)
Psychology help?
2 Opinion