**Correct option: c) 8:3**

**Explanation:**

Let the man rate upstream be x kmph and downstream be y kmph.

Then distance covered upstream in 8 hrs 48 mins = distance covered downstream in 4 hrs x*44/5 =y*4 therefore y=11/5*x.

Required ratio= (y+x):(y-x)/2 = (16x/5*1/2): (6x/5*1/2) =8:3