Final answer:
The sentence that contains a dangling modifier is option B. Typing as fast as I could, it still took me all day to finish the essay.
Step-by-step explanation:
The sentence that contains a dangling modifier is Option B. Typing as fast as I could, it still took me all day to finish the essay.
A dangling modifier occurs when the subject of the main clause and the subject of the modifying phrase do not match. In this sentence, the modifier 'Typing as fast as I could' is intended to modify the subject 'I'. However, 'it still took me all day to finish the essay' does not match 'Typing as fast as I could', resulting in a dangling modifier.
To correct this sentence, you could rephrase it as 'Even though I typed as fast as I could, it still took me all day to finish the essay.'