Is often the target of criticism in invasion literature.
a. education spending
b. economic policy
c. the election process
d. military strength

D). Military strength.

Explanation:

Invasion literature was highly popular during the late 19th century and early 20th century(during world war I). Such literature offered the perturbation led by the speculative invasions of foreign powers. The writings of this literature were inclined towards criticizing 'military' strength through the creation of war imageries. This type of literature investigates the nation's potential to counter the pounce/attack which was greatly influenced by the German attack/invasion of England. Thus, option D is the correct answer.

1.the hosts on two opposing mountains stood,  

2.thick as the foliage of the waving wood;  

3.between them an extensive valley lay,  

4.o'er which the gleaming armour pour'd the day,  

5.when from the camp of the philistine foes,

6. dreadful to view, a mighty warrior rose; in the dire deeds of bleeding battle skill'd,

the underlined phrase is an example of : understatment