He is one of the persons who make money
* persons who make
* person that made
* persons who are making
* persons making
* person who made
Should be between A and C but C sounds better for me.
In A, who make money doesnot seem logical to me cuz everybody makes money.
In C, "who are making money" seems logical cuz it is talking about the people who are making money. It is excluding those who are not making money where as A doesnot excluding anyone.
Even A talks about particular set of people excluding others !!