Introduction:
Ramcharitmanas is an epic poem composed by Goswami Tulsidas, making option 'B' the correct answer. It is one of the most important literary works in the Hindi language and holds great significance in Hindu culture and spirituality.

Tulsidas:
Goswami Tulsidas was a 16th-century saint-poet who lived in present-day Uttar Pradesh, India. He was a devotee of Lord Rama and composed numerous devotional works, with Ramcharitmanas being his most famous creation. Tulsidas wrote Ramcharitmanas in the Awadhi dialect, making it accessible to the masses and playing a significant role in popularizing the story of Lord Rama.

Ramcharitmanas:
Ramcharitmanas is an epic retelling of the Hindu epic Ramayana. It consists of seven books, called Kandas, which narrate the life and adventures of Lord Rama, his wife Sita, and his loyal devotee Hanuman. The poem is written in the form of chaupais (quatrains) and is divided into chapters called sargas.

Significance:
1. Popularization of Lord Rama's story: Tulsidas' Ramcharitmanas played a crucial role in popularizing the story of Lord Rama among the masses. It made the epic accessible to people who couldn't understand the original Sanskrit version of the Ramayana.

2. Devotion and spirituality: Ramcharitmanas holds immense spiritual and devotional value for millions of Hindus. It is often recited during religious ceremonies, festivals, and individual prayers. The poem's verses are considered powerful and believed to invoke the blessings of Lord Rama.

3. Cultural impact: Ramcharitmanas has had a profound impact on Indian culture, literature, music, and art. It has inspired countless adaptations, plays, songs, and performances across different regions of India.

4. Language and literary contribution: Tulsidas' choice of composing Ramcharitmanas in the Awadhi dialect, rather than Sanskrit, made the poem accessible to a wider audience. It helped in the development and standardization of Awadhi as a literary language.

Conclusion:
Goswami Tulsidas, a 16th-century saint-poet, composed Ramcharitmanas, making option 'B' the correct answer. This epic poem has played a significant role in popularizing the story of Lord Rama, holds great spiritual and cultural importance, and has made a lasting contribution to the Hindi language and literature.