The answer is D. You have to keep the verb tenses the same as well as active/passive voice. For 'A', you have active voice/passive voice. For 'B' and 'C', the verb tenses are not the same (b is present tense/past tense and c is past tense and past perfect tense). 'D' can be the only correct answer in following grammar rules.
Answer:
your answer would be (d. Former African American soldiers wanted fair treatment,
especially given their service in war.
Explanation:
D. all these oppressed me.
If teachers are allowed to have a carry on (gun), it would allow them to protect against a shooter or intruder on the campus they work on. With proper training and discipline they could use their carry on or gun to protect not only their selves but other students. teachers would no longer be defenseless in case of an active shooter situation. The downside is that some teachers may use it to threaten students, but that is why with proper discipline and training teachers could save lives just with a gun on their side.