To solve this question, the user needs to have knowledge about the characters and plot of the Hindu epic 'The Ramayana'. At the beginning of the story, Rama and Lakshmana are taken on a quest by a certain character. The user needs to identify this character from the given options.

The correct answer is: C. Viswamithra

Explanation:

In 'The Ramayana', Rama and Lakshmana are taken on a quest by the sage Viswamithra. Viswamithra was a powerful and wise sage who sought Rama's help in fighting off demons that were disrupting his meditation. Viswamithra recognized Rama's divine nature and saw him as the perfect warrior to help him on his quest. Together, they journeyed to the forest to confront the demons and protect the land. Therefore, option C is the correct answer.

Option A, Vali, is incorrect because Vali is a character from the epic 'Ramayana' but he did not take Rama and Lakshmana on a quest at the beginning of the story.

Option B, Sumanthra, is also incorrect because he is a character from 'The Ramayana' but he did not take Rama and Lakshmana on a quest at the beginning of the story.

Option D, Jatayu, is incorrect because Jatayu is another character from 'The Ramayana' but he did not take Rama and Lakshmana on a quest at the beginning of the story.