You're looking at the left side (driver's perspective) of a 103 engine bay. This hose goes from a metal pipe coming from heater core area, thru the firewall and attachs to the very bottom rear of the head. It has a small branch off hose along with it. P/N that I pulled off it is no good. My guess is D, but I want to make sure. TIA!

A. Engine to heat exchanger

B. Return line to engine

C. Engine to feed line

D. Engine to core: left

E. none of the above