Final answer:
The sign given to nomadic tribes to recognize their homeland was likely a constellation, as ancient civilizations used the stars for navigation and cultural storytelling, regarding them as symbols of guidance connected to the divine.
Step-by-step explanation:
Based on the context provided, the correct answer to the question, 'Who gave a sign to the nomadic tribe by which they could recognize their homeland?', is d) A star or constellation. Ancient cultures, such as the Chinese, Egyptians, and Greeks, found ways to recognize their location and navigate using groupings of stars in the sky, known as constellations. These constellations served as an unaided eye guide which was crucial for identifying directions and significant locations, effectively becoming signs of their homeland or important territories.
Constellations often commemorated great heroes, dangers, or events in the legends of the people who named them, helping not just in navigation but also in imparting cultural knowledge and lore to subsequent generations. Moreover, the belief that celestial bodies were directly connected to the whims of gods made any sign in the sky, like a constellation, vitally important for interpreting divine intentions and seeking favor.