Answer:
B. Expository
Step-by-step explanation:
Expository - writing in which the author’s purpose is to inform or explain the subject to the reader.
Practical/technical writing is normally press releases, memos, reports, business proposals, etc.
A personal narrative recounts an event or experience from the writer's life in story form and often in intimate detail.
Research writing is the process of sharing the answer to your research question with your own reasoning and explanation.