In this quatrain from Owen Seaman's poem "Pro Patria," what does the word just mean?

England, in this great fight to which you go
Because, where Honour calls you, go you must,
Be glad, whatever comes, at least to know
You have your quarrel just.

A.
that the war that England faces has only recently begun

B.
that the soldiers will be proud to fight for their country

C.
that the English soldiers will face danger with honor

D.
that the soldiers are engaged in a war that needs to be fought

i think the answer is c

the following key ideas correctly express the key sentence.

restate key idea: most people can learn to swim in ten short lessons.

restate key idea: the majority of water-accident victims require mouth-to-mouth breathing.

restate key idea: an empty, tightly closed gallon jug will support a tired swimmer.  

restate key idea: first aid is to prevent accidents as well as assist in rescue.

explanation: the key idea needs to have the same topic as the key sentence (drowning and safety).

answer: c

explanation: