Fill in the blank with a suitable preposition.
The baby was crying _______ the night, so no one was able to sleep.
The preposition ‘throughout’ denotes a whole period of time’, i.e. from beginning to the end. In the given context, the baby was crying the whole night and therefore everyone was unable to sleep. Thus option A is correct. On the other hand, ‘until’ is unsuitable because if the baby was crying only ‘until’ night then people could have slept at night. Since this is not the case in the given context option D is incorrect. The preposition ‘for’ in the given context would become a preposition of reason thereby meaning that the baby was crying because it was the night. Thus option B is incorrect. Whereas ‘behind’ here would mean something is at the back of something else, which is irrelevant in the given context. Hence option C is incorrect.