The correct answer is letter A.
Explanation: Orthodox Jews is one of the three great branches of Judaism, a strand characterized by the relatively strict observance of customs and rituals in their most primitive and traditional form, according to the rules established by the Torah and the Talmud, and immediately developed and applied by the later authorities known as Gueonim, Rishonim and Arraronim. Orthodox Judaism generally consists of two different strands, Modern Orthodox and Ultra Orthodox.
Reform Jews is a movement that emerged in Germany within Judaism that advocates the introduction of new concepts and ideas in Jewish practices, in order to adapt them to the present moment.