Determine Whether the Pair of Fractions Is Equivalent $\frac { 3 } { 9 } \text { and } \frac { 21 } { 63 }$

Determine whether the pair of fractions is equivalent.
- $\frac { 3 } { 9 } \text { and } \frac { 21 } { 63 }$

A) equivalent
B) not equivalent