For each blank select one entry from the corresponding column of choices. Fill all blanks in the way that best completes the text.

Ancient generals, lacking modern technologies such as radio and satellite communication, often found that one of the most significant challenges in warfare was accurate _______ of the myriad of changes on the battlefield or in the campaign.

a. Fortification 

b. Adulteration 

c. Appraisal 

d. Accretion 

e. Adumbration