Can you help me understand the process for how they arrived at these answers? The explanation in the book was very unhelpful. I'm having trouble understanding how to set this up and it's on my test coming up this week so I'd really appreciate the help understanding this concept! :)

Problem 15-17 Consider the following time series. 1 3 4 5 6 11 9 14 15 a. Choose the correct time series plot. (i) 16 16 14 14 12 12 10 10 Time Series Value Time Series Value 0 2 3 4 5 1 2 3 4 Time Period (t) Time Period (t) (iii) 16 (iv) 16 14 14 2 Check My Works used