Today there are enough hydrogen bombs of the greatest destructive power to wipe out all life on our planet. Will we make even larger bombs in future? We can, if we want to, but even for the most overwhelming military purposes we do not need to. We have already reached some sort of limit. How much more dangerous can the situation get? At the present time, we are very near the edge of death. Every year or two in some major international crises - there is serious probability of an 'accident' that would lead to nuclear war. Dedicated men have worked hard and long in these situations to avoid a nuclear incident, but we may not continue to be so lucky. Next time it may be a nuclear threat or a mad man or a mistaken junior officer or just faulty equipment. It is foolish of us to boast of the decrease in our death rate and increase in the length of individual human lives in the 20th century, as long as this nuclear danger is so uncontrolled. This situation cannot continue. We cannot live very long walking on loose at the edge of a cliff. Either in ten, twenty or thirty years we fall over the nuclear cliff, or else very soon, before that time runs out, we have to arrive at an international understanding and move back from the danger.
In the phrase' before that time runs out (last para) 'that time' refers to the time

Options

A. Till we can expect to hold out
B. When some international crisis may take place
C. That has already passed
D. When making of nuclear bomb may stop

Answer

A