Write the Rate as a Fraction in Simplest Form $\frac { 12 \text { tests } } { 72 \text { students } }$

Write the rate as a fraction in simplest form.
-12 tests for 72 students

A) $\frac { 12 \text { tests } } { 72 \text { students } }$
B) $\frac { 6 \text { tests } } { 1 \text { student } }$
C) $\frac { 1 \text { test } } { 6 \text { students } }$
D) $\frac { 1 \text { tests } } { 2 \text { students } }$