Answer:
Option B, The water in the glass entered the raisins
Step-by-step explanation:
The concentration of water with in the resin is much lower than that of the glass of drinking water. Due to this difference in concentration, a concentration gradient is established which forces the water to move from region of high concentration (i.e glass) to the region of low concentration (i.e with in the resin) thereby causing the resins to swell.
Hence, option B is correct.