According to Things Fall Apart by Chinua Achebe, in Igbo custom, it is required during the Week of Peace for "Everyone must live in harmony, avoiding violence and harsh words." (Option C)
A custom is a series of codes or values, or ways of doing things which must be abided by those who are sword to it or with whom such practices are associated with.
Think of customs as values and ethics of a particular sect of people.
Igbo customs or practices includes of old rituals as well as new notions introduced into Igbo culture through cultural evolution or external influence.
The Igbo people's
are all part of their customs and traditions.
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