Identify which one of the following sentences is missing punctuation. Please correct the error and explain why the correction is necessary a. I woke up when the book slipped from my lap and landed on my foot.

b. After the book slid from my lap and landed on my foot I realized that I had fallen asleep

b: After the book slid from my lap and landed on my foot, I realized that I had fallen asleep.

The sentence that is missing punctuation is option b:

After the book slid from my lap and landed on my foot I realized that I had fallen asleep.

The correction that is necessary is adding a comma after "foot" in the sentence:

After the book slid from my lap and landed on my foot, I realized that I had fallen asleep.

The comma is necessary because it helps to separate the two independent clauses in the sentence. The first independent clause is "After the book slid from my lap and landed on my foot." The second independent clause is "I realized that I had fallen asleep." Without the comma, the sentence becomes a run-on sentence, which can be confusing for the reader. Adding the comma clarifies the sentence structure and makes it easier to understand the relationship between the two clauses.