The correct answer is: Both I and II follow.
The statement “Death keeps no calendar” means that death can come at any time, regardless of age, health, or other factors. This means that both conclusions I and II follow.
Conclusion I: Man must die one day.
This conclusion follows from the statement because death is inevitable for all humans. No matter how old or healthy we are, we will eventually die.
Conclusion II: Death can come at any time.
This conclusion also follows from the statement because death is not predictable. It can come at any time, regardless of our age, health, or other factors.
Therefore, both conclusions I and II follow.