Final answer:
The narrative suggests that Elijah's ministry was effective in its context and contributed to the nation's return to covenant faithfulness with Yahweh, although the historical cycles of adherence to the covenant among the Hebrews varied over time.
Step-by-step explanation:
In examining Elijah's ministry, we understand it as part of the Prophetic Movement which sought to bring the Hebrews back into covenant faithfulness with Yahweh. The historical records within the Bible depict Elijah's efforts as influential in combating idolatry and reestablishing the exclusive worship of Yahweh as well as adherence to the laws of Moses. During Elijah's time, the Prophetic Movement indeed had an impact on shifting the nation towards monotheistic worship and may have contributed to an eventual return to covenant faithfulness, though the degree to which this was sustained over time can be subject to interpretation.
The narrative around Elijah's ministry suggests that it was effective in its immediate context, particularly in opposition to the actions of figures like King Manasseh who restored polytheistic practices. However, throughout the history of the Hebrews, there were cycles of returning to and falling away from the covenant with Yahweh, leading the answer to this question to be A. True, with an understanding that the return to covenant faithfulness was an ongoing struggle for the nation of Israel throughout its history.