Read this excerpt from a book of rules for monks.

idleness is the enemy of the soul. and therefore, at fixed times, the brothers ought to be occupied in manual labour; and again, at fixed times, in sacred reading.

on the basis of this excerpt, what is of central importance for a monk?

a. being busy in one way or another
b. knowing when to work and when to rest
c. studying hard at all times
d. working together as brothers