Which group would not have supported Arnall? A-governors
B-black voters
C-18 year olds
D-prisoners

Most likely other governors.

Explanation:

Arnall had a very lengthy history with other governorrs while he was in office and most did not support the things he was doing in office because he refused to give up his seat in office. He lowered the voting age, so it wouldn't be C. He helped the south fight against discrimination so it wouldn't be A, and he helped with state reform which means that D wouldn't really have anything against him, so the answer should be A.

porter is writing economic history because he is focusing on the cost of developing vaccines.