A. in citing cases, the unofficial cite should precede the official cite.
b. when citing to the united states code, all three publications (i. e., u. s.c., u. s.c. a. and u. s.c. s. must be set forth.
c. in citing persons who are parties to litigation, cite the person's last name only.
d. all federal court opinions have parallel cites.

Explanation:

A. In citing cases, the unofficial cite should precede the official cite. - FALSE.

b. When citing to the United States Code, all three publications (i.e., U.S.C., U.S.C.A.and U.S.C.S.) must be set forth. - FALSE.

c. In citing persons who are parties to litigation, cite the person's last name only. - TRUE.

d. All federal court opinions have parallel cites. - TRUE

the group i'm selecting: greeks.

a first group of greek immigrants came to the us in the 1850s. the second group came to america starting in the 1890s due to economic opportunities they didn't have back in their home caused by the hardships of ottoman rule. greek immigration was 90% male, many of them expected to work and return to greece after earning enough capital, but ultimately had to remain in the us after the greek genocide.