Corps : army unit ::

A. dossier : back

B. dissident : disagreement

C. author : concordance

D. corpus : collected writing

E. carrion : decay

The correct pair of words should be:

D. corpus : collected writing

In the first set of example, the pair constitute the first word to the second word which means that there is collective and selective words. They have a direct relationship because one word is directly a part of the other word.