Final answer:
The safest black hole to avoid being destroyed by tidal forces is a supermassive black hole since they have relatively weaker tidal forces compared to smaller black holes.
Step-by-step explanation:
The safest black hole to avoid being destroyed by tidal forces would be a supermassive black hole (option c). Supermassive black holes have extremely large masses, ranging from millions to billions times the mass of the Sun. As a result, their tidal forces are not as strong as those of smaller black holes. When approaching the event horizon of a black hole, tidal forces increase. These forces exert exponentially stronger gravitational pulls on different parts of the body, causing a phenomenon known as spaghettification. The difference in force on the feet and the head can be extreme, eventually tearing an object apart. However, due to their large mass, supermassive black holes have relatively weaker tidal forces compared to smaller black holes, making them a safer option.