Sutkagendor was a western Harappan trading outpost connecting the civilisation with —

Sutkagendor, near the Makran coast, functioned as a western Harappan trading outpost linked to routes toward the Persian Gulf and Mesopotamia. Greece, China and the Roman Empire do not fit the Harappan chronological and commercial context. Mesopotamia and the Persian Gulf trade network fits that evidence because it matches the specific chronology, agency and function contained in the question. A comparison with the alternatives is useful: Greece, China and The Roman Empire 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 Mesopotamia and the Persian Gulf trade network together with the factual context above, not the isolated option letter.