Final answer:
The Mishnah is relevant according to Do sick because (D) it guides contemporary Jewish practice and is a cornerstone for Jewish life and law. It provides a code of Jewish law that influences the daily practices and spirituality of the Jewish community, maintaining its identity through time.
Step-by-step explanation:
According to Do sick, the Mishnah is still relevant today because it guides contemporary Jewish practice (D). The Mishnah, together with the Gemara, forms the Talmud, which is a collection of sacred Jewish oral interpretation of the Torah. The Mishnah provides a comprehensive code of Jewish law and serves as a cornerstone for Jewish life and law, influencing daily practices, ethics, and spirituality within the Jewish community.
The commitment to living by the laws captured in the Mishnah, which include religious customs, marriage laws, dietary laws, and the duty to study sacred texts, has allowed Judaism to maintain its identity even in the diaspora. This 'mobile tradition' helped the Jewish people preserve their distinct culture and religion throughout history, despite persecution and the absence of a stable homeland. The continued relevance of the Mishnah reflects the ongoing adherence to its principles in today's Jewish religious life.