Which transaction should result in a SAR/STR filing?

Which transaction should result in a SAR/STR filing?
A . A small business owner deposits checks totaling $9,950 USD on a daily basis without providing a legitimate purpose.
B. A small business owner deposits $25,000 USD in cash proceeds with a business equipment bill of sale.
C. A national food-chain restaurant with multiple cash transactions at various branch locations.
D. A national food-chain restaurant makes multiple, anticipated cash transactions that are above the daily reporting threshold.

Answer: A

Explanation:

Reference: https://aml-cft.net/library/suspicious-transaction-report-str-suspicious-activity-report-sar/