NBA scouts are always interested in the relationship between the height of NBA players and their respective wingspans. An NBA scout randomly selects $19$ players and measures their heights and wingspans. Below is the computer regression analysis of height and wingspan.
Dependent variable is wingspan.
$R^2 = 0.787$
$S = 2.23$
Degrees of Freedom = $17$
Assuming all the conditions for inference are met, which of the following represents the test statistic for testing the null hypothesis that the slope of the population regression line equals $0$?