To simplify \( 12513 \), we first recognize that it does not lend itself to simplification unless it's meant to be read in a different context (like if it is not clearly specified whether it's \( 125 \) followed by \( 13 \) or if it's a composite number). However, if the task is to provide the simplest form of \( \sqrt{125} \):
- Finding \( \sqrt{125} \): \[ \sqrt{125} = \sqrt{25 \times 5} = \sqrt{25} \times \sqrt{5} = 5\sqrt{5} \]
So, \( \sqrt{125} \) simplifies to \( 5\sqrt{5} \).
It seems like the provided options may refer to different contexts, but if the question is purely about \( 125 \), none of the provided answers directly seem to answer that specific query since \( 12513 \) does not break down easily without more context.
If you're looking for \( \sqrt{125} \), the simplest form is \( 5\sqrt{5} \). If taking \( 12513 \) as a number, it is already in its simplest form. If there's a misunderstanding with the contexts, please clarify!