A Yagi antenna uses a gamma match. The centre of the driven element connects to:

This question tests the anatomy of a gamma match from the perspective of the driven element. Because the physical center of the unbroken driven element in a Yagi sits at zero RF potential, it serves as the grounded reference point for the matching system. When feeding this antenna with an unbalanced coaxial line, the ground side of the coax—the outer braid—must connect to this zero-potential center. The center conductor of the coax is routed through a capacitor to the gamma rod to match the higher impedance point further out on the element.