To answer this question, we need to have knowledge about the characters from the Hindu epic, Ramayana.
Option A) Supraja - This option is incorrect because Supraja is not mentioned as the mother of Lakshmana in the Ramayana.
Option B) Kaika - This option is incorrect. Kaika is the mother of Bharata, not Lakshmana.
Option C) Sumithra - This option is correct. Sumithra is the mother of Lakshmana. She was one of the wives of King Dasharatha and the mother of Lakshmana and his twin brother, Shatrughna.
Option D) Kousalya - This option is incorrect. Kousalya is the mother of Lord Rama, not Lakshmana.
The correct answer is C) Sumithra. Sumithra is the mother of Lakshmana.