The correct answer is: C. QPSR
The sentence is about my brother’s attempt to contact me, but he was unsuccessful because I was out of the office. The correct sequence of the sentence is:
Q: My brother could not contact me.
P: He dialled frequently on telephone.
R: As I had gone out of office.
S: And had left no information.
The sentence is in the past tense, so the verb “dialled” should come after the verb “could not contact”. The information about my brother’s attempt to contact me (he dialled frequently) is more important than the information about why he was unsuccessful (I had gone out of office), so the clause “he dialled frequently on telephone” should come before the clause “as I had gone out of office”. The information about why he was unsuccessful is also more important than the information about whether he left any information, so the clause “as I had gone out of office” should come before the clause “and had left no information”.
Therefore, the correct sequence of the sentence is:
Q: My brother could not contact me.
P: He dialled frequently on telephone.
R: As I had gone out of office.
S: And had left no information.