Final answer:
The term for the elder sister of one's mother is culturally specific. In the context of this question, 'Bua' is the appropriate term as it refers to the father's sister in some South Asian cultures.
Step-by-step explanation:
The question seems to be asking for the term used to describe the elder sister of one's mother. In many cultures, specific terms are used to define the relationships within a family. The elder sister of one's mother would be commonly referred to as an 'aunt'. The correct term from the options provided would be 'Bua' which refers to the father's sister in some South Asian cultures. However, based on the cultural context, different terms may apply.