Hello!!
Let's look at each one individually:
Upper left:
There's points very far to the left of the line. This is not a good answer.
Bottom left:
Many of the pints are quite faraway to the right of the line. This is also not a good answer.
Upper right:
Besides for the two points on the line, all of the other points are to the right of the line. This is definitely not a very good option.
Bottom right:
There are an even number of points to either side of the line. This is the best linear model for the data.
Hope this helps!! Let me know if you have ANY questions.