'Q' will be the first part of the given sequence as per the subject verb agreement rule, that is, 'robbers entered'. 'S' will come next as it states the time of entering the village, that is, 'at night'. 'R' will follow next as it talks about the after happening of entering the village, that is, after entering they stole the property of the villagers and 'P' will be the last as 'while' indicates that the robbery was done at the time when villagers were sleeping. Hence, QSRP is the correct sequence. Thus, option (a) is correct.