The correct answer is B. Mark Twain was born in 1835 in Missouri. When he was four, his family moved to a small town on the banks of the Mississippi River. At eighteen, he went to New York City.
This is because chronological order refers to the order of time, or ordering things that occurred from the earliest point in someone's life onward until the most recent. This description only applies to answer option B. The other answer choices display other writing styles, like problem/solution in Option C and compare/contrast in Option A.
Therefore, your answer is Option B because it lists the events of Mark Twain's life in the order that they occurred, or chronological order.
Hope this helps!