Which of the following is a requirement for all u. s citizens over 18? A. serve in the military
B. Attend a public school
C. respond when summond to jury duty
D. apply for naturalization

c. respond when summoned to jury duty

Explanation:

First, no one can be forced to go to the military, unless they reinforced the draft.

Second, when a u.s. citizen turns 18 they no longer legally are forced to attend school

Last, naturalization is for non citizens trying to become u.s. citizens

Therefore that leaves you with c

(I hope that helped)

abraham lincoln  (february 12, 1809  – april 15, 1865) was an american statesman, politician, and lawyer who served as the 16th  president of the united states  from 1861 until  his assassination  in april 1865. lincoln led the nation through the  american civil war, its bloodiest war and its greatest moral, constitutional, and political crisis.[2][3]  he preserved the  union,  abolished slavery, strengthened the  federal government, and modernized  the u.s. economy.