He decided to accost a big financier for his new scheme.

Answer: Option C

Employ : give work to (someone) and pay them for it.
Consult : seek information or advice from (someone, especially an expert or professional).
Approach : an initial proposal or request made to someone.
Deceive : deliberately cause (someone) to believe something that is not true, especially for personal gain.
Accost : approach and address (someone) boldly or aggressively.

Synonym of Accost is Approach