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答案：D
解析：
Choice D is correct. When delivering newspapers, Mr. Bumble travels 100 blocks every 2 weeks. This gives the ratio of 100 blocks to 2 weeks, which can be represented by the fraction 100 blocks/2 weeks.
Mr. Bumble delivers newspapers 50 weeks of the year. Therefore, 1 year of delivering newspapers = 50 weeks.
Let b be the number of blocks Mr. Bumble travels during one year or 50 weeks of delivering newspapers. To find the value of b, we can set up a proportion.
100 blocks/2 weeks equals b blocks/50 weeks
Now, use the proportion to solve for b.
Mr. Bumble travels 2500 blocks delivering newspapers in 1 year.
