The answer is false. The first rule of diving is actually this: Never hold your breath.
the answer is B. False for recreational dives but for diving as a sport into a pool it is probably a good idea to check that the water is deep enough for you not to injure yourself
You do not want to dive in unknown waters that may end up being to big and dangerous to dive in, You also may be at a shallow part and starting the dive may encounter dangerously close contact.
just have more confidence in yourself.