Certain combinations of cations and anions lead to the formation of colored salts in solid state even though each of these ions with other counter ions may produce colorless salts. This phenomenon is due to temporary charge transfer between the two ions. Out of the following, the salt that can exhibit this behavior is

A

$$\text{SnCl}_2$$

B

$$\text{SnCl}_4$$

C

$$\text{SnBr}_2$$

D

$$\text{SnI}_4$$