What is the most logical next event?

Two girls in karate class bow forward and then to each other before practice. the girl

Pick your answer from:
(a). in the black dress sits to either side of the kneeing girl..
(b). in the back take her turn to bow forward and forward..
(c). in karate uniforms bows at the bottom of the beam..
(d). dodges an attack by taking a knee while blocking a hit..
(d).