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• "Elimination of a racial group by killing" is- গ) Genocide.

• Genocide (noun)
- English Meaning: the crime of intentionally destroying part or all of a national, ethnic, racial, or religious group, by killing people or by other methods.
- Bangla Meaning: গণহত্যা।

অন্যদিকে,
ক) Ethnocentrism (noun)
- English Meaning: belief that a particular race or culture is better than others.
- Bangla Meaning: একটি নির্দিষ্ট জাতি বা সংস্কৃতি অন্যদের চেয়ে ভালো এমন বিশ্বাস।

খ) Apartheid (noun)
- English Meaning: (in the past) a political system in South Africa that legally separated people of different races.
- Bangla Meaning: (দক্ষিণ আফ্রিকা) বর্ণবৈষম্য (নীতি); বর্ণবাদ (নীতি); ইউরোপীয় এবং অ–ইউরোপীয়দের পৃথকীকরণ।

ঘ) Homicide (noun)
- English Meaning: the crime of killing a person; murder.
- Bangla Meaning: নরহত্যা।

Source:
1. Accessible Dictionary by Bangla Academy.
2. Cambridge Dictionary.