I would say that it's best to use D, compare and contrast. In a compare and contrast writing, two subjects are being compared and contrasted. Depending on how you organize your writing, you can talk about one subject first and then the other.
B. Equals
For a chemical equation to be balanced the number of each type of atom must stay the same.
18)B - Illuminate
19)D - To Write
The answer you’re looking for might be “Successful”
19 is personification and numbness 20 is “a memory sequence ....”