Concept:The word 'ram' refers to an adult male sheep. Its feminine counterpart is a female sheep, known as an 'ewe'.
Explanation:Given the word 'ram', we need its feminine form.
Option A 'sita' is a proper noun, not a gender-specific animal term.
Option B 'toe' is a body part, unrelated.
Option C 'ewe' is specifically an adult female sheep, which matches the feminine of ram.
Option D 'filly' is a young female horse, not a sheep.
Thus, only 'ewe' correctly denotes the female sheep.
Answer:C. ewe