Answer:
True
Step-by-step explanation:
"The Will to Believe" is a lecture by William James. It was first published in 1896 and defends the adoption of a belief without evidence of its truth.
In this lecture, James defines a "momentous option" is an irrevocable option for significant stakes. A momentous choice is supposed to be taken at the moment, because there will not be a second opportunity to make it.
Therefore, a momentous option is a choice between alternative beliefs that cannot be postponed (there won't be a second opportunity) or, at least, can only be postponed with significant loss.