Find the Reference Number For $t = - \frac { 26 \pi } { 5 }$

Multiple Choice

Find the reference number for $t = - \frac { 26 \pi } { 5 }$

A) $- \frac { \pi } { 5 }$

B) $\frac { 26 \pi } { 5 }$

C) $- \frac { 13 \pi } { 5 }$

D) $5 \pi$

E) $\frac { \pi } { 5 }$