What was the old kingdom achievements?

he achievements in this time (mostly in the 4th Dynasty) include: the building of pyramids, including the Great Pyramid of Giza, under Pharoah Khufu. sculptures of people and stone reliefs on tombs and temples. the Great Sphinx, likely under Pharoah Khafre. Also, Beginnings. With its capital at Memphis, site of the Third Dynasty court of Pharoah Djoser (formal name Neterikhet, which means "Divine of the Body"; his reign 2630–2611 BC), the Old Kingdom is known today as the "Age of the Pyramids" for the large number of pyramids constructed as pharaonic burial places. And another is  hieroglyphic writing it was the formal writing system used in Ancient Egypt. Hieroglyphs combined logographic, syllabic and alphabetic elements, with a total of some 1,000 distinct characters. Cursive hieroglyphs were used for religious literature on papyrus and wood. The later hieratic and demotic Egyptian scripts were derived from hieroglyphic writing, as was the Proto-Sinaitic script that later evolved into the Phoenician alphabet. Through the Phoenician alphabet's major child systems, the Greek and Aramaic scripts, the Egyptian hieroglyphic script is ancestral to the majority of scripts in modern use, most prominently the Latin and Cyrillic scripts (through Greek) and the Arabic script and Brahmic family of scripts (through Aramaic).

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the correct answer is

d) rocket launcher