Write a introduction. Then add three paragraphs about what you did. Then add a conclusion closing the essay. That’s all you have to add
To do it by hand with no equipment
It is true that a well-written paragraph should be coherent and unified. These characteristic are some of the most important ones when it comes to writing essays.
For question 1, I believe it is B.
For question 2, I think it is B too.
I might get this wrong tho.