Size of a rice seed bed in one decimal land (excluding drain) is —

• a$10\text{m} \times 4\text{m}$
• b$9.5\text{m} \times 1.5\text{m}$
• c$5\text{m} \times 2\text{m}$
• d$8\text{m} \times 3\text{m}$