The correct answer is: C. set
The word “set” means to establish or found something, or to put something in a particular place or position. In this case, the father-in-law set his son-in-law up in business by providing him with the resources and support he needed to get started.
The other options are not as accurate. The word “put” means to place something in a particular position or location. The word “made” means to create or produce something. The word “built” means to construct something from materials.
In this case, the father-in-law did not simply place his son-in-law in business, nor did he create or produce a business for him. Instead, he provided him with the resources and support he needed to build his own business.