Explanation:

- The lioness is feeding her cubs.

- Her is used because "lioness" is a female noun, and we use "her" for possession relating to a female subject.

- Correct Answer: Option:1, her

- The lioness is feeding its cubs.

- "Its" is generally used for non-gender-specific subjects or animals when gender is unknown. In this case, we know the subject is female.

- The lioness is feeding his cubs.

- "His" is used for male subjects, and since a lioness is female, this is incorrect.

- The lioness is feeding those cubs.

- "Those" does not specify possession and does not fit well in this context.