Joanne measures the heights and arm spans of the girls on her basketball team. She plots the data and makes a scatterplot comparing heights and arm spans, in inches. Joanne finds that the trend line that best fits her results has the equation y= x + 2. If a girl on her team is 63 inches tall, what should Joanne expect her arm span to be?
A. 63 = x + 2
x = 61 inches
B. y = 63 + 2 = 65 inches
C. y = 63 inches
D. y = 63- 2 = 61 inches