Consider a pipe that branches out into two parallel pipes and then rejoins at a junction downstream. The two parallel pipes have the same lengths and friction factors. The diameters of the pipes are 2 cm and 4 cm. If the head loss in one pipe is 0.5 m, the head loss in the other pipe is

(a) 0.5 m 

(b) 1 m 

(c) 0.25 m 

(d) 2 m 

(e) 0.125 m