Help which answer, I think my answer is wrong pls help!!

Will mark BRAINLIST!!!

Super ultra mega important if you can answer this correctly i will give you 100 points but if you don't answer it correctly you'll get a big report. so stay aware and have a nice day!

Which of the fallowing best completes the sequence 12,8,5, a) 1 b) 2 c)4 d)0

If the slope of one line equals the slope of another line then ? a) the two lines are intersecting lines b) the two lines are perpendicular lines c) the two lines are parallel lines d) the two lines always have very steep slopes