Which sentence uses commas correctly? a. some rain has acid in it and this, can be dangerous. b. this " acid rain "can kill trees ,and ,it can also poison fish. c. take a belly flop in the pool, and you'll find that the water feels pretty hard. d. water itself is pure but ,it may carrry poisons in it.

  plan: i will begin with a quotation about the importance of unity in a community. then, i will state my claim that an activity will unite our school by creating a shared vision, purpose, and direction. in the body, i will use three main points that describe the different avenues the students can take: through a variety of clubs, through a special event, or through an awareness week. i will provide evidence about other towns that have unity activities and the kinds of events that they include. pictures will illustrate my three main points in action. for the ending, i will restate the main idea in a new way and pose a question to keep the audience thinking. 

the answer a: perseverance !

d

explanation:

i think that it is letter d.