The following question consists of an incomplete sentence or a sentence that is split into four parts. All four parts are jumbled up and are named P, Q, R, and S. These four parts are not given in their proper order. Arrange the jumbled parts of the sentence and find out which of the four combinations from the given options will correctly complete the sentence.

I do not know__________________________ since March, 2015.

P: about the current status

Q: the exact reasons why

R: of the whole affair

S: he has not been responding to me