What Is the Atomic Symbol for an Element with 39 ${ }_{81}^{89} \mathrm{Na}$

What is the atomic symbol for an element with 39 protons and 50 neutrons?

A) ${ }_{81}^{89} \mathrm{Na}$
B) ${ }_{39}^{50} \mathrm{Y}$
C) ${ }_{39}^{89} \mathrm{Y}$
D) ${ }_{50}^{89} \mathrm{Sn}$
E) ${ }_{89}^{227} \mathrm{Ac}$