Select the most appropriate phrasal verb to fill in the blank:

Prior to submitting the report to the board, the auditor decided to ______ the financial statements to ensure all figures were accurate.

The correct answer is go over.

Explanation:
In the given context, the auditor needs to examine or review the financial statements carefully to ensure that all figures are accurate before submitting the report to the board.

Let us analyze the meanings of the provided phrasal verbs:

1. Go over: To examine, review, or check something carefully.
2. Call off: To cancel an event, meeting, or plan.
3. Turn down: To reject an offer or request, or to reduce volume/heat.
4. Break in: To enter a building forcibly or illegally, or to interrupt a conversation.

Therefore, go over is the most appropriate phrasal verb to complete the sentence correctly.