Why did the professor have patents?

Choices:
A. Because he was an inventor
B. Because he had psycho-motor aggression
C. Because he had a new baby
D. not enough information
Because he was an inventor
Like many other inventors before him, professor Slawomir Suwak designed only the things he needed himself. He had several patents on his conscience already: an automatic cork opener for wine in the indicative state, a portable set of board games for solving personality problems, a wallet with a mini-device for the duplications of 100 zloty bills, and a piece of equipment "the day after" used to irretrievably eliminate from the time-space continuum days burdened with a hangover.
Now came the time for a mini-device preventing the development of symptoms of psycho-motor aggression.
The device was really simple. It weighed about a kilo and was the size of a bag of flour. It was to be worn on the right wrist. The fact it had to be the right wrist was very important. Otherwise, the invention didn't work properly, or even worse, it produced results opposite to its intended effect.
Each day, its mini-containers had to be re-filled with substances promoting positive processes in the body leading to the return of good mood. There were three containers to re-fill, and the substances were not available on the local market and had to be imported using diplomatic channels from the USA. To operate the device, turning it on stand-by was enough. In that mode, it could be used continuously for one and a half hours. To recharge the batteries, you needed a charger, which was stored in a small suitcase. The device, when it was turned on, made a low murmur (or according to some - a loud growl) designed to keep the owner in a good mood.
Professor Suwak called his new baby "mini-anti-aggressor."
The McPhilips corporation expressed its interest in the product early on, even when it was still at the drawing-board stage. The company partially financed the purchase of sub-assembly elements from its subsidiary specializing in the productions of components for technologically advanced products.