The southernmost subsidiary pyramid of the Great Pyramid is traditionally identified as Queen Henutsen’s pyramid, designated G1-c.
G1-c stands on the eastern side of the Great Pyramid complex, alongside the pyramids commonly labeled G1-a and G1-b. It is the southernmost of the three surviving queen’s pyramids associated with Khufu’s monument. The structure is about 46.25 metres wide and originally stood roughly 29.6 metres high.
The attribution to Henutsen comes chiefly from a New Kingdom inscription on a stela found near the pyramid’s associated temple. That evidence is later than the pyramid itself, so Egyptologists describe the identification as probable rather than absolutely certain. This is why references may discuss G1-c by its architectural designation instead of using Henutsen’s name.
The other names in the choices are common mix-ups: Hatshepsut and Nefertiti belonged to much later periods, while Meritites is associated with the Fourth Dynasty but not securely identified as the owner of G1-c.