Answer
Choice$\quad e)$
Work Step by Step
Typical percentage problem:
What percent ($n$, as a decimal number) of (the base amount $y)$ is $x?$
Translated:$\quad n\cdot y=x$
---
Here, reworded:$\quad 57\%$ of $a$ is $23?$
Translated:$\quad 0.57\cdot y=23$
Choice$\quad e)$