Given below are two statements. One is labelled as Assertion (A) and the other is labelled as reason (R). 

(A) is true because the rotation of plane polarized light, also known as optical rotation, is a property of chiral molecules. When a chiral molecule is dissolved in a solvent, the interaction between the molecule and the solvent molecules can affect the molecule's conformation and thus its ability to rotate plane polarized light. Different solvents can have different effects on the chiral molecule's conformation, and thus different solvents can lead to different degrees of optical rotation.

(R) is also true because the degree of optical rotation of a chiral molecule depends on its concentration as well as its specific properties. The greater the concentration of the chiral molecule, the greater the rotation of plane polarized light. Additionally, different chiral molecules have different degrees of optical rotation, which can be influenced by factors such as their structure and functional groups.