A lab technician making a fresh sugar solution noticed that the optical ... ...

A lab technician making a fresh sugar solution noticed that the optical activity of the sugar solution changed after the solution had been standing for several hours. This change in optical activity is best explained by the phenomenon called:
(A) Tyndall effect.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in 29. Carbohydrates