Ziggurats were massive stepped pyramid-like structures built as religious temples. Each city in Mesopotamia had its own ziggurat dedicated to its patron deity. Temples to honor gods fits that evidence because it matches the specific chronology, agency and function contained in the question. A comparison with the alternatives is useful: Military forts, Grain storage and Royal palaces are genuine historical terms or names, but each belongs to a different office, patron, text, region or sequence. Reading the question as a relationship among person, period, place and institutional purpose prevents that mistake. The compact memory link is therefore Temples to honor gods together with the factual context above, not the isolated option letter.