Omana called her maternal grandmother "Ammumma". The correct answer is option C, which states that Ammumma refers to Omana's mother's mother. Let's discuss this answer in detail.

Explanation:

Maternal and paternal are terms used to describe relationships based on the mother's or father's side of the family. Understanding these terms will help us determine whom Omana called Ammumma.

- Maternal side: The maternal side refers to relationships connected through the mother. This includes the mother, maternal grandmother, maternal grandfather, maternal aunt, and maternal uncle.
- Paternal side: The paternal side refers to relationships connected through the father. This includes the father, paternal grandmother, paternal grandfather, paternal aunt, and paternal uncle.

In this question, Omana called Ammumma, which means her mother's mother. Let's analyze the other options to understand why they are incorrect:

a) Mother's aunt: This option suggests that Omana called her mother's aunt Ammumma. However, the term Ammumma is commonly used to refer to one's grandmother, not an aunt. Therefore, this option is incorrect.

b) Father's mother: This option suggests that Omana called her father's mother Ammumma. However, the term Ammumma is typically used to refer to one's maternal grandmother, not paternal grandmother. Therefore, this option is incorrect.

d) Father's aunt: This option suggests that Omana called her father's aunt Ammumma. As mentioned earlier, the term Ammumma is commonly used to refer to one's grandmother, not an aunt. Therefore, this option is incorrect.

In conclusion, the correct answer is option C, which states that Ammumma refers to Omana's mother's mother.

B