Answer:
(a) operating a Ponzi scheme
Step-by-step explanation:
Ponzi scheme -
It is a type of fraud , which attracts investors for getting better profit in returns , is referred to as Ponzi scheme.
These schemes , attracts investors , with fake promise and exceptional deals , and then does not fulfil , any promise , and can lead to a big scam.
Hence , from the question, the example shown is about a Ponzi scheme.