Final answer:
Naheed's father believed that d. cleanliness was important to Allah in addition to one's beliefs, as indicated by the practice of wearing clean garments for Friday service.
Step-by-step explanation:
Based on the provided reference texts and the context of religious practices and beliefs, it seems that cleanliness was emphasized as an important aspect to Allah alongside one's belief. The reference to people wearing clean white garments on Fridays for the service illustrates the value placed on cleanliness. This aligns with the Islamic principles which include personal hygiene as a significant aspect of faith. Therefore, in the context of Naheed's father's beliefs mentioned in the question, the correct answer appears to be Cleanliness.