The correct answer is C because the FI is unable to obtain evidence of required licensing or registration despite suspicion of money transmitting, which is a red flag for money laundering and a violation of federal and state laws. Option A is incorrect because making several deposits in one month that appear to exceed their expected monthly income might not be indicative of suspicious activity, depending on the customer’s profile and source of funds. Option B is incorrect because receiving a large, one-time wire from a law firm might not be indicative of suspicious activity, depending on the customer’s relationship with the law firm and the purpose of the wire. Option D is incorrect because discovering a large number of securities transactions that appear to be related to day trading might not be indicative of suspicious activity, depending on the customer’s investment strategy and risk tolerance.

References: Money transmitter - Wikipedia; The Quick Guide To Money Transmitter Licenses - Surety Bond Insider; Financial Crime Typologies - Intermediate Certificate, Module 3.