Students of a Bengaluru college choose Kannada, Telugu or Tamil as a language. By how many does the Kannada total exceed the Telugu total?

Kannada total $=34+8+6+4=52$ and Telugu total $=21+8+11+4=44$, so the difference is $52-44=8$. 13 compares only the single-language parts $34-21$, 96 adds the totals, and 5 is $11-6$, the difference of the parts shared with Tamil.