The first choice is correct
B - Down. Just try and see if it makes sense to be in the sentence
6-3x=5x-10x+2
Add 5x and -10x and you get -5x
6 - 3x = -5x + 2 ( add -5 to the other side)
6+2x=2
now subtract 6 from both sides
2x = -4
divide both sides by 2 to get x by itself
x=-2
A comma may be useful after
introductory phrases because it avoids confusion and makes sentence flow
easier. The correct answer between all the choices given is the
third choice or letter C. I am hoping that this answer has satisfied your query
and it will be able to help you in your endeavor, and if you would like, feel
free to ask another question.