I believe the answer is C. corporate rates
Corporate rates is usually adjusted solely because you're staying for business reasons. On average, corporate rates would be lower compared to normal rates because usually the hotel and the corporation already made some long-term arrangement.
Definitely not performing the act would decrease your chances of catching an STD superbly. The only other way you'd get an STD would be for you sharing some bodily fluid say during needle sharing, for those that spread through such means. Your answer is C
Correction* Vaccinations and Mutual Monogamous relationships, also reduce the risk for STDS
