Which of the following practices is associated with L'ovolah ul shomrah?

The practice associated with L'ovolah ul shomrah, which translates to "to serve and to protect," is particularly focused on the Jewish responsibility towards the environment. This concept emphasizes the ethical duty of stewardship over the Earth, reflecting a broader commitment to caring for God's creation. It highlights the belief that humans have a role in preserving and safeguarding the natural world, making the choice related to caring for the environment the correct answer.

While the other practices mentioned, such as observing dietary laws, conducting prayer services, and celebrating Jewish holidays, are fundamental aspects of Jewish life and identity, they do not directly align with the specific theme of L'ovolah ul shomrah. Observing dietary laws pertains to kashrut, which governs what foods are permissible; conducting prayer services relates to communal worship; and celebrating Jewish holidays celebrates significant events and historical moments in Jewish tradition. Each of these practices serves distinct purposes within Judaism but does not encapsulate the environmental responsibility central to L'ovolah ul shomrah.