Final answer:
The correct answer is option B) India and Pakistan.
Step-by-step explanation:
The two countries that have had an issue with religious boundaries in the past are India and Pakistan (B). The division of India and Pakistan during the Partition in 1947 was fundamentally influenced by religious differences, with Pakistan becoming a predominantly Muslim state and India having a Hindu majority. This division has led to several conflicts, most notably over the region of Kashmir. This area has been a contentious point due to the religious and water resource implications for both countries, as explained in the Kashmir conflict scenario where religious differences have fueled political tensions.
Moreover, the early war between India and Pakistan right after the border partition almost mimicked the more recent disputes over Kashmir, highlighting the enduring nature of the religious conflict. There is a strong element of this conflict that is rooted in the distinctions between Islam and Hinduism, in addition to significant political dimensions.
The religious boundary issues between India and Pakistan are emblematic of the challenges that can arise when political borders coincide with significant religious demarcations, often leading to deep-rooted animosity and protracted conflicts.