Concept: Colon Classification is a faceted classification scheme developed by Dr. S. R. Ranganathan. Its editions are important in the history of library classification.
Step 1: Understanding Colon Classification.
Colon Classification introduced a faceted approach to classification, using concepts such as personality, matter, energy, space and time.
\[
\text{Colon Classification} \Rightarrow \text{Faceted classification scheme}
\]
Step 2: Identifying the edition asked.
The question asks about the sixth edition of Colon Classification.
\[
\text{6th edition of CC} \Rightarrow \text{1963}
\]
Step 3: Selecting the correct option.
Among the given options, 1963 is option (C).
Therefore, the correct answer is 1963.