The proper way to correct the sentence is to separate the sentences by commas and the last sentence with the word "and". Then it would look like this: "When Harold went racing down the hill on his sled, he hit a large bump, flew into the air, and landed safely on the ground" (option B).
To correct a grammatical error in a sentence we must read it again and identify the error. In this case the error is that the word "and" is repeated twice.
According to the above, we must delete the "and" that is between the sentences "He hit a large bump" and "flew into the air" and replace it with a comma. So the sentence would look like this:
Learn more about sentences in: https://brainly.com/question/18728726
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