Step 1: Concept
The Bhakti Movement was a religious movement that emphasized personal devotion to a deity. It contributed significantly to the development of literature in regional languages, promoting devotional poetry and songs.
Step 2: Meaning
Assertion (A) states that the Saints of the Bhakti Movement contributed richly to the development of literature in regional languages. Reason (R) states that the preaching of Guru Nanak founded the Sikh religion.
Step 3: Analysis
Assertion (A) is accurate as many saints during the Bhakti Movement wrote devotional poetry and songs, which enriched regional literatures.
Reason (R) is also true since Guru Nanak indeed established the Sikh religion through his teachings and preaching.
However, Reason (R) does not explain or support Assertion (A). The founding of Sikhism by Guru Nanak is unrelated to the literary contributions made by Bhakti Movement saints.
Step 4: Conclusion
While both statements are correct individually, Reason (R) does not provide an explanation for Assertion (A).
Final Answer: (B)