Step 1: Understanding the context.
This question is referring to a specific instance in the story *"Valli's Journey"* by the famous Indian writer, *R.K. Narayan*. In the story, Valli, a young girl, travels to the town on a bus. The fare for her journey is mentioned as **twenty paise** one way.
Step 2: Analysis of options.
(A) Thirty: This is incorrect because the bus fare mentioned in the story is not thirty paise.
(B) Forty: This is also incorrect as the fare is not forty paise.
(C) Fifty: While fifty paise is a plausible amount for a bus fare, it is not the correct amount mentioned in the story.
(D) Twenty: This is the correct answer. Valli's fare from her village to the town was **twenty paise** one way, as stated in the story.
Step 3: Conclusion.
The correct answer is (D) twenty, as the fare was twenty paise.