Step 1: Identifying the author.
The works *Sawarnai* and *Rays* are well-known writings of Puran Singh, a prominent Punjabi poet, philosopher, and thinker.
Step 2: Analyzing the options.
(A) Vidyapati: He was a Maithili poet, not connected with these works.
(B) Puran Singh: Correct — He authored both *Sawarnai* and *Rays*.
(C) Durga Prasad Panda: Incorrect, he did not write these works.
(D) Laxmi Prasad Devkota: He was a famous Nepali poet, but not related to these titles.
Step 3: Conclusion.
Thus, the correct answer is (B) Puran Singh.