Solve Simplify the Answer $11 \frac { 1 } { 2 }$

Multiple Choice

Solve. Simplify the answer.
-Chris rode her bicycle $11 \frac { 1 } { 2 }$ miles on Tuesday. On Thursday, she rode $6 \frac { 4 } { 9 }$ miles. What was her total biking distance for those two days?

A) $17 \frac { 17 } { 18 } \mathrm { mi }$
B) $18 \frac { 17 } { 18 } \mathrm { mi }$
C) $16 \frac { 17 } { 18 } \mathrm { mi }$
D) $11 \frac { 17 } { 18 } \mathrm { mi }$