Rip Van Winkle is a fictional character from a short story written by Washington Irving. According to the story, Rip Van Winkle fell asleep in the Catskill Mountains and woke up after a long period of time. The correct answer is option 'A', which states that Rip Van Winkle was asleep for 20 years.

Explanation:
1. Background of the story:
- The story of Rip Van Winkle is set in the late 18th century in a small village located at the foot of the Catskill Mountains.
- Rip Van Winkle is described as a lazy and easygoing man who avoids any kind of work.
- One day, while wandering in the mountains, he encounters a group of strange men playing nine-pins. He drinks their liquor and falls into a deep sleep.

2. Rip Van Winkle's sleep:
- When Rip Van Winkle finally wakes up, he is disoriented and discovers that the world around him has changed significantly.
- He finds that his appearance has aged, his beard has grown long, and his gun is rusty.
- Rip Van Winkle is told by the townspeople that he has been asleep for 20 years.

3. Changes in the world:
- During Rip Van Winkle's long sleep, the American Revolution took place, and the United States became an independent country.
- Rip Van Winkle's friends and acquaintances have either passed away or aged significantly.
- The village has undergone changes, and the people have different customs and clothing styles.

4. Rip Van Winkle's adjustment:
- Rip Van Winkle faces challenges in adjusting to the new world and the changes that have occurred during his sleep.
- He realizes that he has missed out on important events and experiences.
- Rip Van Winkle eventually accepts his fate and becomes a beloved figure in the village due to his kind nature and storytelling abilities.

In conclusion, Rip Van Winkle was asleep for 20 years, as mentioned in the story by Washington Irving. The story explores the concept of time and change, highlighting the challenges faced by Rip Van Winkle upon waking up to a world that has moved on without him.

Correct answer is a