Final answer:
The correct answer is A) sacred, Golden, Harmandir, God. The most sacred building in Sikhism is the Golden Temple, commonly known as Harmandir Sahib, meaning 'temple of God'. The letter A) provides the correct answer to the fill-in-the-blank question.
Step-by-step explanation:
The most sacred building in the Sikh religion is the Golden Temple at Amritsar, in the Punjab. Its proper name is Harmandir Sahib, which means 'temple of God'. Sri Harmandir Sahib, also referred to as the Golden Temple, is a highly revered spiritual site of Sikhism situated in Amritsar, Punjab, India.
It is not only a central religious place for the Sikhs but also a symbol of human brotherhood and equality. Everyone, irrespective of cast, creed, or race, is welcomed at the Harmandir Sahib. The temple's architecture embodies Sikh values and represents a distinct heritage.