The largest prime factor of 16384 is 2 , because 16384=2^{14}. What is the sum of the digits of the largest prime factor of 16383 ?

**Answer Choices**

A. 3

B. 7

C. 10

D. 16

E. 22

The largest prime factor of 16384 is 2 , because 16384=2^{14}. What is the sum of the digits of the largest prime factor of 16383 ?

**Answer Choices**

A. 3

B. 7

C. 10

D. 16

E. 22