Which religious group was influenced by the Old Testament but declares itself the fulfillment of its teachings?

The correct choice is Islam. This religious group views itself as the culmination and fulfillment of the teachings found in the Old Testament, which is part of the shared scripture known as the Hebrew Bible. Muslims believe that the revelations given to the Prophet Muhammad, as found in the Quran, complete and perfect the messages that were revealed to previous prophets, including those mentioned in the Old Testament, such as Moses and Abraham.

Islam acknowledges the importance of the Old Testament and sees its teachings as part of a broader narrative that culminates in the Quran. This perspective is rooted in the belief that while the Old Testament contains true teachings, those teachings are completed and further clarified through the revelations made to Muhammad.

In contrast, other options do not align with this description. Hinduism does not have a direct relationship with the Old Testament, as it has its own set of sacred texts and beliefs. Judaism also holds the Old Testament as its sacred scripture but does not claim to fulfill its teachings in the same way Islam does. Buddhism, being a non-theistic religion, does not engage with the Old Testament or see itself as fulfilling its teachings. Thus, Islam stands out as the religious group explicitly claiming to be the fulfillment of the Old Testament's messages.