Which one it’s i can’t seem to find the answer.

-- Take a piece of paper
-- Take a pencil or a pen
-- Write the first nine or ten terms of the sequence:

Term   Value
  #1          0 
  #2          0.5
  #3          1
  #4          1.5
  #5          2
  #6          2.5
  #7          3
  #8          3.5
  #9          4
#10          4.5

-- Now, find the graph of that sequence of numbers.

Hint:  It's Graph-D .