Giulio Holds a Bag of 70 Marbles in His Hands

Multiple Choice

Giulio holds a bag of 70 marbles in his hands.Jim blindfolds Giulio and keeps adding marbles to Giulio's bag,one at a time.However,Giulio notices the difference in the weight only after Jim has added 5 marbles.They now repeat the same experiment with a bag of 140 marbles.This time,Giulio notices the difference in the weight only after Jim has added 10 marbles.This scenario BEST illustrates:

A) signal detection theory.
B) Weber's law.
C) accommodation.
D) Ricco's law.