Please see the work below.
Work Step by Step
As we know, $pK_a= -log(K_a)$. The strength of an acid depends on $K_a$ which means that the higher the value of $K_a$, the stronger the acid will be, and thus the value of $pK_a$ will be lower. From the given data, we conclude that $H_A$ is a stronger acid because it has a lower value of $pK_a.$